Christoph Deil

Yesterday @woodmd , @cboisson and I had a Google hangout and discussed this. Here's the summary: - @cdeil had so far mis-understood the current [SED](http://gamma-astro-data-formats.readthedocs.io/en/latest/results/flux_points/index.html) format. The reference model mentioned...

I think we discussed this before, but now I can't find the issue. Maybe it was via email? Or in HESS? Currently the [psf_table](http://gamma-astro-data-formats.readthedocs.io/en/latest/irfs/psf/psf_table/index.html) format spec has: > Recommended axis...

@jknodlseder - I found the issue where we discussed this ... in February you commented that following OGIP axis order for RPSF is OK: https://github.com/open-gamma-ray-astro/gamma-astro-data-formats/pull/28#issuecomment-188149267 I don't care either way....

I've made the change in #58. Closing this issue now. If someone sees this later and disagrees, feel free to comment here or make a new issue proposing another change.

@TarekHC - I don't remember if there were small pros / cons for certain axis orders or if what we have now is just what people had implemented and thus...

> But below you say that different order will not work for gammapy... So in the end (unfortunately) it does matter. Just because the Gammapy IRF classes need a bit...

> Is that what was decided in the CTA SUSS workshop? Yes, we all agreed, it's now an official requirement: > CTA-SUSS-42 - Tarek must produce perfect DL3+ data model...

@jknodlseder - A few questions: - What are current high-energy missions (Fermi, Chandra, XMM, ...) using? Integer or string for `OBS_ID`? - In tools like Gammalib and Gammapy, would we...

@jknodlseder - Do you still think CTA / IACT DL3 data should change OBS_ID to be a string instead of an int? It would be quite a big breaking change,...

@jknodlseder - Thank you for taking the initiative on this! This doesn't just affect Gammalib and the Fermi ST as mentioned in the title and description, but also Gammapy and...