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Hmmmm
That didn't go well!!
I upped the exposure to 40 x 30s to get better SNR, and "re-adjusted" the grating and slit assembly to get more consistent positioning on the CCD. The results: Rubbish!
Almost three hours of wasted time - I honestly should have recognised the symptoms - problems with PHD (which I very rarely have) and abnormal low subs signal....
Bumma.
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