question: @ Override public void deleteRows ( int start , int len ) throws FitsException { try { if ( this . nRows == 0 || start < 0 || start >= this . nRows || len <= 0 ) { return ; } if ( start + len > this . nRows ) { len = this . nRows - start ; } ensureData ( ) ; for ( int i = 0 ; i < this . nFields ; i += 1 ) { Object o = ArrayFuncs . newInstance ( this . types [ i ] , this . nRows - len ) ; System . arraycopy ( this . data [ i ] , 0 , o , 0 , start ) ; System . arraycopy ( this . data [ i ] , start + len , o , start , this . nRows - len - start ) ; this . data [ i ] = o ; } this . nRows -= len ; } catch ( FitsException e ) { throw e ; } catch ( Exception e ) { throw new FitsException ( "Error deleting row:" + e . getMessage ( ) , e ) ; } }
target:  Delete rows from a FITS table