! Import table for UKIRT linear polarimetry data. ! ! WPLATE: ! This gives the waveplate angle from some reference axis defined ! by the instrument. This reference axis is usually known from ! calibration measurements so that the measured polarisation position ! angle can be related to a true position angle on the sky. ! This keyword is required to be present in the input data since it ! is necessary for polarimetric image processing. The angle is expected ! to be in degrees. WPLATE WPLANGLE 0=0.0,45=45.0,22.5=22.5,67.5=67.5 ! IMGID: ! This is a unique character identifer particular to each image and will ! be used to refer to the image throughout the data reduction sequence. ! It is constructed from the data of the observation and the observing ! sequence number of the exposure. If not supplied (if commented out ! for instance, or if the UTDATE and/or RUN keywords are not available), ! it defaults to the name of the data file. _CHAR IDATE _CHAR RUN IMGID? RUN//IDATE ! FILTER: ! The filter used to make the observations. Where more than one filter ! is used (for example when there are several filter wheels in the ! beam) then this should be a combined filter name. If not supplied (if ! commented out for instance, or if the FILTER keyword is not ! available), it defaults to the value of WPLATE. FILTER? FILTER