question: @ Override protected void fillHeader ( Header head ) { try { Standard . context ( UndefinedData . class ) ; head . setXtension ( "UNKNOWN" ) ; head . setBitpix ( BasicHDU . BITPIX_BYTE ) ; head . setNaxes ( 1 ) ; head . addValue ( NAXISn . n ( 1 ) , this . data . length ) ; head . addValue ( PCOUNT , 0 ) ; head . addValue ( GCOUNT , 1 ) ; head . addValue ( EXTEND , true ) ; } catch ( HeaderCardException e ) { LOG . log ( Level . SEVERE , "Unable to create unknown header" , e ) ; } finally { Standard . context ( null ) ; } }
target:  Fill header with keywords that describe data.