I am working on my first IDL project and wanted to get a few ideas about the possibility of doing two things with the help of IDL. If you examine http://img115.imageshack.us/img115/3544/ncepfieldrk6.png, you'll see that an example of the output I am working with. The problem I have is that the field output is always to a different temperature scale as are the vector arrows. It is strenuous trying to compare output images that have completely different scales, so hopefully I can figure this out. I'd like to set a maximum value for the vector arrows (say, 15 m/s) and anything larger than that to be colored a different color. I'd also like to be able to set a minimum temperature (say 290 K ) and a maximum temperature ( say 375 K) for all of the outputs, rather than have them be decided on a per output basis. Is there a way to accomplish this? Any and all input and comments are appreciated. Thanks.