In the WHT observing logs, please note that LocT and LocRH wrongly show the same values as AirT and Hum respectively from the 12th of June 2002 to the 1st of August 2013. The values of Wspd and Gust are given in km/h not in km/s, as stated in the column headers, from the 5th of April 2002 to the 1st of August 2013. In the INT observing logs this is the case from the 22nd of May 2002 to the 5th of August 2013, and in the JKT observing logs from the 23rd of May 2002 to the 5th of August 2013. Observations Log The WHT observations logs have a fixed format, with some columns being used for all observations, some for spectroscopy only, some for adaptive-optics only. Exposures with visiting instruments using their own detectors are usually not logged automatically. The columns are: Run Run number. The corresponding file name is the run number preceded by 'r'. Object Name as typed in by the observer when exposing or, if the observer enters no name, the name of the object at which the telescope is currently pointing. RA Format: hh mm ss.ss Dec Format: dd mm ss.s Equinox Equinox of the coordinates given in the previous two columns. UT UT start. Airm Airmass. Instr Abbreviated instrument name e.g. ISISR, ISISB (the two arms of ISIS). Texp Exposure time (sec). Sky PA Sky positional angle (deg) as measured from North to East. Filters Filters in the light path. Slit Slit width (arcsec), where relevant. Grat Grism Diffraction grating or grism in the light path, where relevant. CenwA Central wavelength (Angstrom), where relevant. -- NAOMI -- NAOMI parameters, for adaptive-optics (AO) observations: L indicates the lenslet array being used in the wavefront-sensor (WFS); WM is the readout mode (first letter F = 80 x 80 pixels, B = (binned) 40 x 40 pixels, T = tip-tilt mode); Twfs is the WFS integration time in msec. l indicates the AO-loop status (O for open, C for closed). INGR INGRID (IR detector) parameters: Co = number of frames being co-averaged; M = Readout mode. Comments Comments, as entered in the log by the observer.