# Re: slp anomalies as contours and wind vector anomalies as overlayed vectors

From: Mary Haley <haley_at_nyahnyahspammersnyahnyah>
Date: Fri Apr 08 2011 - 09:30:54 MDT

Hi Ed,

First, I noticed that you have cnFillOn set to True, and then you have

vcres@vcVectorDrawOrder = "Predraw"

Is it possible that the vectors are being drawn, but are covered up by the filled contours? If so, try changing the above "Predraw" to "Draw".

If this is not the problem, then the next thing I would check is if I have the lat/lon coordinate arrays set up correctly.

>From your script below, it looks like you're doing the right thing, because you have:

u_anom!0="lat" ;; Assign lat and lon coordinates to u_anom to enable plotting
u_anom!1="lon"
u_anom&lat=lat
u_anom&lon=lon

v_anom!0="lat" ;; Assign lat and lon coordinates to v_anom to enable plotting
v_anom!1="lon"
v_anom&lat=lat
v_anom&lon=lon

The next thing is to do a "printVarSummary" on u_anom and v_anom, as this will print out information about your variable, including the ranges of your lat/lon coordinate arrays. Also print out the min/max of these arrays, to make sure the values are about what you expect:

printVarSumary(u_anom)
printVarSummary(v_anom)
print("min/max u_anom = " + min(u_anom) + "/" + max(u_anom))
print("min/max v_anom = " + min(v_anom) + "/" + max(v_anom))

Take a close a look at all this output:

- Do you have the _FillValue set correctly, if any?
- Do the min/max values look about right
- Are the lat/lon coordinate arrays in the correct range?

If none of this helps, then can you provide your data?

--Mary

On Apr 8, 2011, at 8:04 AM, Ed Martino wrote:

> NCL Listers
>
> A few months ago I wrote an ncl script to plot slp anomalies as contours
> and wind vector anomalies as overlayed vectors. I use this script on
> NCEP monthly slp and wind reanalysis data. My orginal script runs fine
> when using surface wind vector data. I would like to conduct the same
> analysis using wind vector data that includes pressure levels, to
> evaluate wind vector anomalies above the surface such as jet stream
> patterns.
>
> I thought this analysis would be straightforward by using a simple
> modification to my orginal ncl script to 1) change addfile call to input
> wind data that includes pressure levels (uwnd.mon.mean.p.nc versus
> uwnd.mon.mean.nc), and 2) change the dim_avg_n function to average winds
> at different pressure levels in addition to time (months). I copied the
> modified script below this message.
>
> This script is very similar to my working slp contour surface-wind
> vector script with the exception of a few minor changes. For example,
> the line from my original script to average the u wind component for
> December to June 1959 was
>
> u1959=_dim_avg_n(u(131:137,:,:),0)
>
> and I now use wind vector data with pressure levels and changed the
> dim_avg_n call to specifiy months (131-137), as in old working script,
> but now pressure level too. In this example I use pressure level 16,
> from the 17 levels available in this data set.
>
> u1959=dim_avg_n(u(131:137,16,:,:),0)
>
> The script runs but wind vectors do not plot correctly. Wind vectors
> are not visible and I am having some trouble diagnosing the problem. My
> best guess is that the dim_avg_n function cannot be used to average
> across both months and pressure levels at the same time. Alternatively,
> the dim_avg_n call is OK but the vector plot graphic attribute settings
> are causing the problem due to differences in wind vector magnitudes
> above surface level. Perhaps both dim_avg_n and vector graphic
> attributes are causing the problem.
>
> I would appreciate any suggestions.
>
> Thanks.
>
> Ed
>
>
> *** script ***
>
>
>
> begin
>
> ; open netcdf files
>
> ;NOTE the wind and slp files are both monthly mean files
> ;from the NCEP Reanalysis files thus no time/date conversions necessary
>
> time=slp_file->time ;; read the variables from files
> slp=slp_file->slp
> lat=slp_file->lat
> lon=slp_file->lon
>
> u=u_file->uwnd
> lev=u_file->level
> lat=u_file->lat
> lon=u_file->lon
>
> v=v_file->vwnd
> lev=v_file->level
> lat=v_file->lat
> lon=v_file->lon
>
> utc_date = ut_calendar(time(12), -5) ;; use "ut_calender" to check
> the date in year, month,
> print(utc_date) ;; day format, given the the
> index of the "time" variable.
>
> ; first calculate all winds
>
>
> slp1959=dim_avg_n(slp(131:137,:,:),0)
> slp1960=dim_avg_n(slp(143:149,:,:),0)
> slp1961=dim_avg_n(slp(155:161,:,:),0)
> slp1962=dim_avg_n(slp(167:173,:,:),0)
> slp1963=dim_avg_n(slp(179:185,:,:),0)
> slp1964=dim_avg_n(slp(191:197,:,:),0)
> slp1965=dim_avg_n(slp(203:209,:,:),0)
> slp1966=dim_avg_n(slp(215:221,:,:),0) ;; average the Dec-June slp for
> each year of interest
> slp1967=dim_avg_n(slp(227:233,:,:),0)
> slp1968=dim_avg_n(slp(239:245,:,:),0)
> slp1969=dim_avg_n(slp(251:257,:,:),0)
> slp1970=dim_avg_n(slp(263:269,:,:),0) ;; using the "dim_avg_n" function
> slp1971=dim_avg_n(slp(275:281,:,:),0)
> slp1972=dim_avg_n(slp(287:293,:,:),0)
> slp1973=dim_avg_n(slp(299:305,:,:),0)
> slp1974=dim_avg_n(slp(311:317,:,:),0)
> slp1975=dim_avg_n(slp(323:329,:,:),0)
> slp1976=dim_avg_n(slp(335:341,:,:),0)
> slp1977=dim_avg_n(slp(347:353,:,:),0)
> slp1978=dim_avg_n(slp(359:365,:,:),0)
> slp1979=dim_avg_n(slp(371:377,:,:),0)
> slp1980=dim_avg_n(slp(383:389,:,:),0)
> slp1981=dim_avg_n(slp(395:401,:,:),0)
> slp1982=dim_avg_n(slp(407:413,:,:),0)
> slp1983=dim_avg_n(slp(419:425,:,:),0)
> slp1984=dim_avg_n(slp(431:437,:,:),0)
> slp1985=dim_avg_n(slp(443:449,:,:),0)
> slp1986=dim_avg_n(slp(455:461,:,:),0)
> slp1987=dim_avg_n(slp(467:473,:,:),0)
> slp1988=dim_avg_n(slp(479:485,:,:),0)
> slp1989=dim_avg_n(slp(491:497,:,:),0)
> slp1990=dim_avg_n(slp(503:509,:,:),0)
> slp1991=dim_avg_n(slp(515:521,:,:),0)
> slp1992=dim_avg_n(slp(527:533,:,:),0)
> slp1993=dim_avg_n(slp(539:545,:,:),0) ;; averaging months for all years
> slp1994=dim_avg_n(slp(551:557,:,:),0) ;; for anomaly calculation
> slp1995=dim_avg_n(slp(563:569,:,:),0) ;; NOTE should we only use
> years when fish data?
> slp1996=dim_avg_n(slp(575:581,:,:),0) ;; or available years? ESRL
> online tool?
> slp1997=dim_avg_n(slp(587:593,:,:),0)
> slp1998=dim_avg_n(slp(599:605,:,:),0)
> slp1999=dim_avg_n(slp(611:617,:,:),0)
> slp2000=dim_avg_n(slp(623:629,:,:),0)
> slp2001=dim_avg_n(slp(635:641,:,:),0)
> slp2002=dim_avg_n(slp(647:653,:,:),0)
> slp2003=dim_avg_n(slp(659:665,:,:),0)
> slp2004=dim_avg_n(slp(671:677,:,:),0)
> slp2005=dim_avg_n(slp(683:689,:,:),0)
> slp2006=dim_avg_n(slp(695:701,:,:),0)
> slp2007=dim_avg_n(slp(707:713,:,:),0)
> slp2008=dim_avg_n(slp(719:725,:,:),0)
> slp2009=dim_avg_n(slp(731:737,:,:),0)
> slp2010=dim_avg_n(slp(743:749,:,:),0)
>
> u1959=dim_avg_n(u(131:137,16,:,:),0)
> u1960=dim_avg_n(u(143:149,16,:,:),0)
> u1961=dim_avg_n(u(155:161,16,:,:),0)
> u1962=dim_avg_n(u(167:173,16,:,:),0)
> u1963=dim_avg_n(u(179:185,16,:,:),0)
> u1964=dim_avg_n(u(191:197,16,:,:),0)
> u1965=dim_avg_n(u(203:209,16,:,:),0)
> u1966=dim_avg_n(u(215:221,16,:,:),0) ;; average the Dec-June u for
> each year of interest
> u1967=dim_avg_n(u(227:233,16,:,:),0)
> u1968=dim_avg_n(u(239:245,16,:,:),0)
> u1969=dim_avg_n(u(251:257,16,:,:),0)
> u1970=dim_avg_n(u(263:269,16,:,:),0) ;; using the "dim_avg_n" function
> u1971=dim_avg_n(u(275:281,16,:,:),0)
> u1972=dim_avg_n(u(287:293,16,:,:),0)
> u1973=dim_avg_n(u(299:305,16,:,:),0)
> u1974=dim_avg_n(u(311:317,16,:,:),0)
> u1975=dim_avg_n(u(323:329,16,:,:),0)
> u1976=dim_avg_n(u(335:341,16,:,:),0)
> u1977=dim_avg_n(u(347:353,16,:,:),0)
> u1978=dim_avg_n(u(359:365,16,:,:),0)
> u1979=dim_avg_n(u(371:377,16,:,:),0)
> u1980=dim_avg_n(u(383:389,16,:,:),0)
> u1981=dim_avg_n(u(395:401,16,:,:),0)
> u1982=dim_avg_n(u(407:413,16,:,:),0)
> u1983=dim_avg_n(u(419:425,16,:,:),0)
> u1984=dim_avg_n(u(431:437,16,:,:),0)
> u1985=dim_avg_n(u(443:449,16,:,:),0)
> u1986=dim_avg_n(u(455:461,16,:,:),0)
> u1987=dim_avg_n(u(467:473,16,:,:),0)
> u1988=dim_avg_n(u(479:485,16,:,:),0)
> u1989=dim_avg_n(u(491:497,16,:,:),0)
> u1990=dim_avg_n(u(503:509,16,:,:),0)
> u1991=dim_avg_n(u(515:521,16,:,:),0)
> u1992=dim_avg_n(u(527:533,16,:,:),0)
> u1993=dim_avg_n(u(539:545,16,:,:),0) ;; averaging months for all years
> u1994=dim_avg_n(u(551:557,16,:,:),0) ;; for anomaly calculation
> u1995=dim_avg_n(u(563:569,16,:,:),0) ;; NOTE should we only use years
> when fish data?
> u1996=dim_avg_n(u(575:581,16,:,:),0) ;; or available years? ESRL
> online tool?
> u1997=dim_avg_n(u(587:593,16,:,:),0)
> u1998=dim_avg_n(u(599:605,16,:,:),0)
> u1999=dim_avg_n(u(611:617,16,:,:),0)
> u2000=dim_avg_n(u(623:629,16,:,:),0)
> u2001=dim_avg_n(u(635:641,16,:,:),0)
> u2002=dim_avg_n(u(647:653,16,:,:),0)
> u2003=dim_avg_n(u(659:665,16,:,:),0)
> u2004=dim_avg_n(u(671:677,16,:,:),0)
> u2005=dim_avg_n(u(683:689,16,:,:),0)
> u2006=dim_avg_n(u(695:701,16,:,:),0)
> u2007=dim_avg_n(u(707:713,16,:,:),0)
> u2008=dim_avg_n(u(719:725,16,:,:),0)
> u2009=dim_avg_n(u(731:737,16,:,:),0)
> u2010=dim_avg_n(u(743:749,16,:,:),0)
>
> v1959=dim_avg_n(v(131:137,16,:,:),0)
> v1960=dim_avg_n(v(143:149,16,:,:),0)
> v1961=dim_avg_n(v(155:161,16,:,:),0)
> v1962=dim_avg_n(v(167:173,16,:,:),0)
> v1963=dim_avg_n(v(179:185,16,:,:),0)
> v1964=dim_avg_n(v(191:197,16,:,:),0)
> v1965=dim_avg_n(v(203:209,16,:,:),0)
> v1966=dim_avg_n(v(215:221,16,:,:),0) ;; average the Dec-Jvne v for
> each year of interest
> v1967=dim_avg_n(v(227:233,16,:,:),0)
> v1968=dim_avg_n(v(239:245,16,:,:),0)
> v1969=dim_avg_n(v(251:257,16,:,:),0)
> v1970=dim_avg_n(v(263:269,16,:,:),0) ;; vsing the "dim_avg_n" fvnction
> v1971=dim_avg_n(v(275:281,16,:,:),0)
> v1972=dim_avg_n(v(287:293,16,:,:),0)
> v1973=dim_avg_n(v(299:305,16,:,:),0)
> v1974=dim_avg_n(v(311:317,16,:,:),0)
> v1975=dim_avg_n(v(323:329,16,:,:),0)
> v1976=dim_avg_n(v(335:341,16,:,:),0)
> v1977=dim_avg_n(v(347:353,16,:,:),0)
> v1978=dim_avg_n(v(359:365,16,:,:),0)
> v1979=dim_avg_n(v(371:377,16,:,:),0)
> v1980=dim_avg_n(v(383:389,16,:,:),0)
> v1981=dim_avg_n(v(395:401,16,:,:),0)
> v1982=dim_avg_n(v(407:413,16,:,:),0)
> v1983=dim_avg_n(v(419:425,16,:,:),0)
> v1984=dim_avg_n(v(431:437,16,:,:),0)
> v1985=dim_avg_n(v(443:449,16,:,:),0)
> v1986=dim_avg_n(v(455:461,16,:,:),0)
> v1987=dim_avg_n(v(467:473,16,:,:),0)
> v1988=dim_avg_n(v(479:485,16,:,:),0)
> v1989=dim_avg_n(v(491:497,16,:,:),0)
> v1990=dim_avg_n(v(503:509,16,:,:),0)
> v1991=dim_avg_n(v(515:521,16,:,:),0)
> v1992=dim_avg_n(v(527:533,16,:,:),0)
> v1993=dim_avg_n(v(539:545,16,:,:),0) ;; averaging months for all years
> v1994=dim_avg_n(v(551:557,16,:,:),0) ;; for anomaly calcvlation
> v1995=dim_avg_n(v(563:569,16,:,:),0) ;; NOTE shovld we only vse years
> when fish data?
> v1996=dim_avg_n(v(575:581,16,:,:),0) ;; or available years? ESRL
> online tool?
> v1997=dim_avg_n(v(587:593,16,:,:),0)
> v1998=dim_avg_n(v(599:605,16,:,:),0)
> v1999=dim_avg_n(v(611:617,16,:,:),0)
> v2000=dim_avg_n(v(623:629,16,:,:),0)
> v2001=dim_avg_n(v(635:641,16,:,:),0)
> v2002=dim_avg_n(v(647:653,16,:,:),0)
> v2003=dim_avg_n(v(659:665,16,:,:),0)
> v2004=dim_avg_n(v(671:677,16,:,:),0)
> v2005=dim_avg_n(v(683:689,16,:,:),0)
> v2006=dim_avg_n(v(695:701,16,:,:),0)
> v2007=dim_avg_n(v(707:713,16,:,:),0)
> v2008=dim_avg_n(v(719:725,16,:,:),0)
> v2009=dim_avg_n(v(731:737,16,:,:),0)
> v2010=dim_avg_n(v(743:749,16,:,:),0)
>
>
>
> slp_sbass =
> (slp1966+slp1970+slp1993+slp1994+slp1996+slp1998+slp1999+slp2000+slp2001+slp2003+slp2005)/11
> ;; average the Dec-June slp for the 11 years
> slp_all_years =
>
> (slp1961+slp1962+slp1963+slp1964+slp1965+slp1966+slp1967+slp1968+slp1969+slp1970+slp1971+slp1972+slp1973+slp1974+slp1975+slp1976+slp1977+slp1978+slp1979+slp1
>
> 980+slp1981+slp1982+slp1983+slp1984+slp1985+slp1986+slp1987+slp1988+slp1989+slp1990)/30
> slp_anom = (slp_sbass - slp_all_years)
>
> u_sbass =
> (u1966+u1970+u1993+u1994+u1996+u1998+u1999+u2000+u2001+u2003+u2005)/11
> ;; average the Dec-June u wind
> u_all_years=(u1961+u1962+u1963+u1964+u1965+u1966+u1967+u1968+u1969+u1970+u1971+u1972+u1973+u1974+u1975+u1976+u1977+u1978+u1979+u1980+u1981+u1982+u1983+u1984+
>
> u1985+u1986+u1987+u1988+u1989+u1990)/30
> u_anom = (u_sbass - u_all_years)
>
> v_sbass =
> (v1966+v1970+v1993+v1994+v1996+v1998+v1999+v2000+v2001+v2003+v2005)/11
> ;; average the Dec-Jvne v wind
> v_all_years=(v1961+v1962+v1963+v1964+v1965+v1966+v1967+v1968+v1969+v1970+v1971+v1972+v1973+v1974+v1975+v1976+v1977+v1978+v1979+v1980+v1981+v1982+v1983+v1984+
>
> v1985+v1986+v1987+v1988+v1989+v1990)/30
> v_anom = (v_sbass - v_all_years)
>
>
> slp_anom!0="lat" ;; Assign lat and lon coordinates to slp_anom to
> enable plotting
> slp_anom!1="lon"
> slp_anom&lat=lat
> slp_anom&lon=lon
>
> u_anom!0="lat" ;; Assign lat and lon coordinates to u_anom to
> enable plotting
> u_anom!1="lon"
> u_anom&lat=lat
> u_anom&lon=lon
>
> v_anom!0="lat" ;; Assign lat and lon coordinates to v_anom to
> enable plotting
> v_anom!1="lon"
> v_anom&lat=lat
> v_anom&lon=lon
>
>
> wks = gsn_open_wks("X11","slp_anom") ;; Open graphic workstation for
> xwindow or file output
>
>
> ;******** Define RGB triplet colors
> colors = (/ (/255, 255,255/),
> (/15,10,120/),(/20,30,155/),(/25,55,180/),(/28,65,197/),(/29,75,200/), \
>
> (/28,78,200/),(/28,80,210/),(/30,85,210/),(/30,95,215/),(/32,100,220/),(/32,102,220/),(/35,105,228/),(/35,115,228/),
> \
>
> (/37,125,230/),(/37,135,230/),(/37,155,230/),(/38,165,231/),(/38,175,231/),(/39,180,233/),(/39,185,233/),(/40,190,233/),
> \
> (/50,205,232/),(/120,230,245/),(/180,240,255/), \
> (/255, 255,255/),(/255, 255,255/), (/255, 255,255/), \
> (/250,
> 245,175/),(/250,235,165/),(/245,235,165/),(/245,225,155/),(/243,220,140/), \
> (/243,
> 218,135/),(/242,212,125/),(/240,210,118/),(/240,205,115/),(/238,204,112/),(/238,200,108/),
> \
> (/235,
> 200,108/),(/235,185,105/),(/225,180,103/),(/220,175,85/),(/220,150,75/),(/215,130,60/),
> \
>
> (/215,125,55/),(/215,100,45/),(/218,90,45/),(/210,70,35/),(/200,60,15/),
> (/195,55,10/)\
> /) * 1.0 ; we
> multiply by 1.0 to make colors float
> colors = colors/255. ;
> normalize (required by NCL)
>
> gsn_define_colormap(wks, colors) ;
> ; gsn_define_colormap(wks,"nrl_sirkes")
>
>
> res = True
> res@gsnDraw = False
> res@gsnFrame = False
> vcres = res
> mpres = res
>
>
> res@cnFillOn = True ; turn on color fill
> res@lbLabelAutoStride = True ; automatically choose best stride
> res@gsnStringFontHeightF = 0.25
> res@cnLevelSpacingF = 0.2
> res@gsnMaximize = True
> res@gsnPaperOrientation = "auto"
> res@lbLabelAngleF = 45
> res@pmLabelBarOrthogonalPosF = 0.05
> res@tiMainString = "Dec-Jun SLP (millbars) and Wind (m/s)
> Anomalies"
> res@cnLevelSelectionMode = "ExplicitLevels" ; set explicit
> contour levels
> res@cnLevels = (/
> -1.35,-1.30,-1.25,-1.20,-1.15,-1.10,-1.05,-1.0,-0.95,-0.90,-0.85,-0.80,-0.75,-0.70,-0.65,-0.60,-0.55,-0.50,-0.45,-0.40,
> \
> -0.35,-0.30,-0.25,-0.20,-0.15,-0.10,-0.05, 0,
> 0.05,0.10,0.15,0.20,0.25,0.30,0.35,0.40,0.45,0.50,0.55,0.60,0.65,0.70,0.75,0.80,0.85,
> \
> 0.90,0.95,1.0,1.05,1.10,1.15,1.20,1.25,1.30,1.35
> /) ; set levels
> res@cnLinesOn = False ; turn off the contour lines
> res@cnFillDrawOrder = "Predraw"
>
>
> ; Set up some vector resources.
>
> vcres@vcLevelSelectionMode = "ManualLevels"
> vcres@gsnMaximize = True
> vcres@gsnPaperOrientation = "portrait"
> vcres@vcMinLevelValF = -20.0
> vcres@vcMaxLevelValF = 100.0
> vcres@vcLevelSpacingF = 0.25
> vcres@vcGlyphStyle = "LineArrow"
> ; vcres@vcFillArrowsOn = False
> vcres@vcLineArrowColor = -1
> vcres@vcFillArrowFillColor = -1
> vcres@vcFillArrowEdgeColor = -1
> vcres@vcLineArrowThicknessF = 0.50
> vcres@vcMinFracLengthF = 0.005
> vcres@vcMinMagnitudeF = 0.025
> vcres@vcRefLengthF = 0.022
> vcres@vcRefMagnitudeF = 0.30
> vcres@vcRefAnnoOrthogonalPosF = -0.55
> vcres@vcRefAnnoParallelPosF = 0.997
> vcres@vcRefAnnoFontHeightF = 0.010
> vcres@lbTitleString = "Surface Wind Anomaly"
> vcres@lbTitleOffsetF = -1.50
> vcres@lbTitleFontHeightF = 0.005
> vcres@lbLabelFontHeightF = 0.005
> vcres@lbLabelAutoStride = True
>
> ;
> ; Make sure vectors are drawn in "predraw" phase.
> ;
>
> vcres@vcVectorDrawOrder = "Predraw"
>
> ; Control appearance of map.
> ;
> ; mpres@mpProjection = "LambertEqualArea"
> mpres@mpDataBaseVersion = "MediumRes"
> ; mpres@gsnMaximize = True
> mpres@gsnPaperOrientation = "portrait"
> mpres@mpLabelsOn = False
> mpres@mpPerimOn = True
> mpres@mpGridAndLimbOn = False
> mpres@mpFillOn = False
> mpres@mpOutlineOn = True
> mpres@mpOutlineDrawOrder = "PostDraw"
> mpres@mpFillDrawOrder = "Predraw"
> mpres@mpOceanFillColor = 9
> mpres@mpLandFillColor = 43
> mpres@mpGeophysicalLineThicknessF = 1.5
>
> ;
> ; Zoom in on area
> ;
> mpres@mpLimitMode = "LatLon"
> mpres@mpMinLatF = 10.
> mpres@mpMaxLatF = 70.
> mpres@mpMinLonF = -105.
> mpres@mpMaxLonF = -40.
>
> ; Use "overlay" to overlay anomalies for slp and wind
>
> ; slpanom = gsn_csm_contour(wks,slp_anom,res)
> ; windanom = gsn_csm_vector_map(wks,u_anom, v_anom,res2)
>
> slpanom = gsn_csm_contour(wks,slp_anom,res)
> windanom = gsn_csm_vector(wks,u_anom, v_anom,vcres)
> mpid = gsn_csm_map(wks,mpres)
>
> ; Overlay contour and vector plots on the map plot.
>
> overlay(mpid,slpanom)
> overlay(mpid,windanom)
>
> ; Draw to Xwindow
> maximize_output(wks, True)
>
> wks2=gsn_open_wks("ps","slp_wind_anom_sbass")
> gsn_define_colormap(wks2, colors)
>
> slpanom = gsn_csm_contour(wks2,slp_anom,res)
> windanom = gsn_csm_vector(wks2,u_anom, v_anom,vcres)
> mpid = gsn_csm_map(wks2,mpres)
>
> ; Overlay contour and vector plots on the map plot.
>
> overlay(mpid,slpanom)
> overlay(mpid,windanom)
> ; Export Plot
> maximize_output(wks2, True)
>
> end
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Received on Fri Apr 8 09:31:04 2011

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