How to emphasis the upper ocean at xy plot?

Hi,
I am trying to plot ocean depth vs. mixed layer depth (MLD) using:
;=======================================
time = fspan(0,11,12); month
mld = (/20,30,40,50,70,120,140,150,100,90,50,20/);
plot = gsn_csm_xy (wks,time,mld,res)
;========================================
I want to emphasis the upper ocean, eg. one major-tick for every 10m at upper 50m, and every 50m lower, and length of each tick is equal.
So would you please tell me how to do that?
Thanks!
Chen

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Received on Fri Sep 14 04:17:03 2012