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Comments are so common, and so useful, that a 32-byte COMMENT column
should be considered part of the basic data, even though it may be blank for
the majority of the data.
This field may be used to append comments to a particular
observation, such as DOME IN THE WAY?,
MOON ON MIRROR,
General comments, such as
Cirrus low in NW,
or LUNCH BREAK,
should be stored as data with the OBJECT field set to COMMENT.
Comments longer than 32 characters can be split into 32-byte pieces with the
same time value.
The time field MJD_OBS should always be filled in, but the rest can remain