Binary table FITS extension column.
#include <fits.h>
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char * | name |
| Name of the column (title, TTYPE)
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char * | format |
| Format string of the content of the column (TFORM)
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char * | unit |
| Measure unit of the column elements (TUNIT)
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char * | value |
| Default initial value.
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char * | comment |
| Description of the column or data.
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char ** | expected |
| Expected values if checking when read.
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