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I have a question regarding IRAF commands. I want to convert my spectra fits file to ascii file at this moment. I've successfully done so when I used the command called "wspectext". but an error message popped out- "this *.fits is not one dimensional" when i was trying to deal with another spectrum. I examined the
header and found that its dimension is like, 2621x1, does that mean this
spectrum is 2-D? i also tried to find suitable commands to convert 2D spectra
into ascii files, but failed. please give me any suggestions or advice on how to
deal with this kind of problems. thank you in advance and i really appreciate
your help!

Tryusing an image section so the WSPEC task sees only one dimension, e.g.[code:1:01d07e3fba]cl> wspectext foo.fits[*,1] STDOUT[/code:1:01d07e3fba]The IMSLICE task will generally reduce the dimensionality of an image, off-hand though I'm not sure what it would do to the spectral WCS however.-Mike

Thank you so much, Mike!
it worked!!

Yes, thank you very much(!)