 of this array
          contains the matrix XB.

  LDXB    INTEGER
          The leading dimension of the array XB. LDXB &gt;= MAX(1,K+N).

  XG      (output) DOUBLE PRECISION array, dimension (LDXG,2*NB)
          On exit, the leading (K+N)-by-(2*NB) part of this array
          contains the matrix XG.

  LDXG    INTEGER
          The leading dimension of the array XG. LDXG &gt;= MAX(1,K+N).

  XQ      (output) DOUBLE PRECISION array, dimension (LDXQ,2*NB)
          On exit, the leading N-by-(2*NB) part o