Dear Azargoun,<br> As far as I know there is no way to plot a text file using grads. Grads only able to read gridded data such as grib, netcdf and HDF files. As your text data is in a gridded format with a resolution of 0.25 degree you can easily convert this to a binary format and write a ctl file to the converted binary. By this you can plot the data using GRADS. It is possible to convert the data into binary gridded using FORTRAN. <br>
If you are so much particular to plot this using grads this is the only way. But you can use other softwares such as NCL for this purpose since it can handle ascii data directly. Best of luck.<br clear="all">
<br>-- <br>Sincerely<br>***********************************************<br>Jayakrishnan.P.R<br>CSIR-Senior Research Fellow<br>Department of Atmospheric Sciences<br>Cochin University of Science and Technology (CUSAT), Cochin-682 016<br>
Kerala, India.<br>Mob: 09895417565<br><br>***********************************************<br>