Analysis of station data usin GrADS. How to run stnmap utility?

[hiren dave]

dear all users
    I am a new GrADS user and want to know how to analyse station data using GrADS.
I have Lat Lon Stn and amout of rainfall. I want to display that in a GrADS. How can i do?
   Here i have attached one data file and want to display that data i gards. 
I am using window and using grads-1.8sl11-win32e version.


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