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Retrieve header key with gethead

A quick note on gethead of WCSTools – as I have needed many times (but obviously not that many to remember it!). Rather straightforward use: gethead HEADER_KEY image.fits (as simple as possibly!) If HEADER_KEY contains empty spaces then use double quotes, e.g. “HIERARCH TEL AIRM END”. Reminder: you have to have installed already the WCSTools! […]