AMSR-E Swath attributes reading problem

Hi,

 I found a problem in reading attributes from AMSR-E HDF-EOS2 swath
data file with NCL.

Here's the detail.

[Environment]
NCL Version: 5.2.1
OS: CentOS Linux 32-bit
Input file: NSIDC AMSR_E Swath. See [1] below for URL.

[Code]
begin
eos_file=addfile("AMSR_E_L2A_BrightnessTemperatures_V10_200501180027_D.hdf.he2",
"r") data_unscaled=eos_file->89_0V_Res_5B_TB__not_resampled__High_Res_B_Swath
; read specific subset of data field
; print(eos_file);
printVarSummary(data_unscaled)
print(data_unscaled@UNIT)
end

[Output of the above code]
Variable: data_unscaled
Type: short
Total Size: 1941084 bytes
            970542 values
Number of Dimensions: 2
Dimensions and sizes: [DataTrack_lo_High_Res_B_Swath | 1997] x
[DataXTrack_hi_High_Res_B_Swath | 486]
Coordinates:
Number Of Attributes: 2
  coordinates : Latitude_High_Res_B_Swath, Longitude_High_Res_B_Swath
  hdfeos_name : 89.0V_Res.5B_TB_(not-resampled)]
warning:Attempt to reference attribute (UNIT) which is undefined
(0) -999

[Problem]
  If you look at the input file with HDFView as shown in [2], you will
see "UNIT", "OFFSET", and "SCALE_FACTOR" attributes associated with
the swath dataset. However, NCL doesn't read them properly. Thus, I
cannot apply the "short2flt_hdf()" function to the swath datatset.

[Discussion]
 I know I can assign attributes manually and apply scale factor and
offset but I think it would be great if NCL can read those attributes
automatically.

[References]
[1] ftp://ftp.hdfgroup.uiuc.edu/pub/outgoing/NASAHDF/AMSR_E_L2A_BrightnessTemperatures_V10_200501180027_D.hdf
[2] ftp://ftp.hdfgroup.uiuc.edu/pub/outgoing/joe/ncl/AMSR_E_L2A_BrightnessTemperatures_V10_200501180027_D.hdf.89.0V_Res.5B_TB_%28not-resampled%29.attributes.jpg

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