Mandatory keywords in ASCII table extensions.
|2||BITPIX = 8|
|3||NAXIS = 2|
|6||PCOUNT = 0|
|7||GCOUNT = 1|
|(other keywords, including (if TFIELDS is not zero) ...)|
|TTYPEn, n = 1, 2, ..., k where k is the value of TFIELDS (Recommended)|
|TBCOLn, n = 1, 2, ..., k where k is the value of TFIELDS (Required)|
|TFORMn, n = 1, 2, ..., k where k is the value of TFIELDS (Required)|
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