-1 Series of long darks (after a long down time!)
-11 Quartz just in case needed for persistence removal (shouldn't be!)
-12 Start of dither test
+12 Dither test failed due to script error. ThAr lamp left on a couple of hours: turned off and let sit a bit (both for lamp and chip).
-13 Dither test. Up and down twice spaced by 0.2, then 0.5 pixel moves with a premove
-68 Start internal flats: dark + 10 flats + dark