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Invoking the command will bring up a vertical menu with all the pertinent items listed. You can click on any of the items or use the cursor keys to highlight one (followed by {Enter}). In either case, the stored information will be displayed and you will be asked to input a new value. Pressing {Enter} with no other input will retain the old value.
To retain conformity with the FITS format, follow the guidance given for entering new values. Note that leading zeros are important in time and date. For example, use 03:15:01 and 01/05/96. Note that the FITS standard for dates is dd/mm/yy. Thus the example is for the first of May 1996.
This Function can be accessed also with the {Alt} P hot key from the Examine Image mode. Most often you will need to input an Object name. Occasionally, you may have to adjust the UT value of the exposure to record the mid-point time of the exposure.