[gradsusr] open multiple file and SDFopen command

[hossein lotfi]

Hi
can we open multiple file with this method? (
http://www.wrcc.dri.edu/dri/softlib/grads/gradcomdsdfopen.html)
I can only open 1 file from multiple files with this command :   sdfopen
ersst.197301.nc ersst.1973%m2.nc 12
I have 12 file with monthly sst data such as attached file at below
can any one help me?
thanks a lot
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