F/8 engineering night, plus testing on ARCoIRIS. Summary of night´s progress is:

(a) Two complete pointing maps with ARCoIRIS were obtained (with M2 corrections active and inactive).

(b) Extensive nodding-along-slit tests were performed with no failures. Nodding worked well at high, intermediate and low airmasses.

(c) Feature ¨go to backbox¨ and ¨from backbox¨ on the GIRD_Tool_GuI was thoroughly tested. This important feature works well, but

one must remember that its reference point is the red cursor (Star 1 cursor) in the slit graphic. If that red cursor is not set on the slit, or

at nod position-A for instance, the object will not return from the background box to an on-slit position.

(d) Updating the TCS poiting model during the night casue the TCS to lose its pointing. Over an hour lost trying to recover. The TCS

software interface is acting strangely. Claudio A. has asked Omar Estay to investigate.

(e) Editing of the X,Y positions of the cursor stars in the slit graphic window of the GRID_Tool_GuI causes the entire software suite to crash.

(f) Pressing ¨back sus"on the Image Detector window causes that window to freeze. A full software re-start is the only recovery option.

(g) After this Image Detector window crashes and re-start, the ¨SV detector" box was always red (indicating off) even though the SV detector

was clearly  working and receiving photons.

(h) the ¨obstype¨ field in the GUI_settings_guider window is not picking up the observtion type, which is set in the main Spectrograph Detector window,

and remains set to _NONE_ all the time.

(i) On the Image Detector window, we should change the ¨flat sus¨ option label to ¨Flat-field¨.

Quite a good night all-in-all, and the fact that the nodding sequences now seem to be working correctly is an excellent step forward - good work Marco !

thanks to Marco Bonati and Rolo Cantarutti for their excellent remote support.

saludos

DJJ