C--   MXX = max no of x grid points
C--   MQ2 = max no of Q2 grid points
C--   MPD = max no of distributions
C--   MER = max no of error sources
C--   MPA = max no of parameters

      PARAMETER ( MXX  = 120)
      PARAMETER ( MQ2  = 60 )
      PARAMETER ( MPD  = 20 )
      PARAMETER ( MER  = 20 )
      PARAMETER ( MPA  = 30 )