That should be ":results file graphics".


Thanks very much. This works. I guess this has recently changed. I have always used ":results output graphics"



I see that the behaviour changed with 9.3. Release notes (https://www.orgmode.org/Changes.html) have this:

:file header argument no longer assume "file" :results

The "file" :results value is now mandatory for a code block returning a link to a file. The :file or :file-ext header arguments no longer imply a "file" result is expected.

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Thanks a lot for your help.

Vikas