[gradsusr] to mark with letter in plot

[Nibin Gopi]

hi dear gradsusr

i have got reply of my one doubt how to plot range of values so  you
replied it with the following codes. which work nicely . thank you for your
help.

but i want to mark these points with charcter 'v' means vulnerable or zero
or ' NV' or 1 means not vulnerable like that on my plot .



'set cmark 0'
   'display t'
2) 'set cmark 1'
   'set cstyle 0
   'set ccolor 2'
   'd maskout(maskout(t,t-20),30-t)'
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