<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am trying to plot using open Grads. I have opened my .ctl file and it says that my data file was opened. However, when I attempt to plot ‘tas’ it says the following:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Syntax Error: Invalid Operand<o:p></o:p></p><p class=MsoNormal> ‘tas’ not a variable or function name<o:p></o:p></p><p class=MsoNormal> Error occurred at column 1<o:p></o:p></p><p class=MsoNormal>DISPLAY error: Invalid expression<o:p></o:p></p><p class=MsoNormal> Expression = tas<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>‘tas’ is my temperature at surface variable and when I do an ncdump of the data file, it shows ‘tas’ as the variable. Can someone offer any suggestions as to why it won’t let me plot my variable and/or tell me if a command exists for Grads that will list variables that are available to be plotted?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you,<o:p></o:p></p><p class=MsoNormal>Adam<o:p></o:p></p></div></body></html>