\ARRAY MATERIAL_LIST
!
!----------------------------------------------------------------------
! ADD NEW MATERIALS HERE. CALL TO GSMATE
! FORMAT
! CHNAME = 'MATERIAL NAME',
! IMATE = MATERIAL NUMBER
! A = ATOMIC WT
! Z = ATOMIC NUMBER
! DENS = DENSITY
! RADL = RADIATION LENGTH
! ABSL = ABSORPTION LENGTH (IGNORED BY GEANT)
! NWBUF = NUMBER OF EXTRA USER WORDS
! UWBUF = NWBUF EXTRA USER WORDS
!----------------------------------------------------------------------
!
! 	CHNAME 	IMATE	  A 	Z 	DENS 	RADL	ABSL	 NWBUF UWBUF
     'ALUMINUM'     9 26.98   13.0        2.7    8.90    39.4         0
         'IRON'    10 55.85   26.0       7.87    1.76    16.75        0
       'COPPER'    11 63.54   29.0       8.96    1.43    15.06        0
     'TUNGSTEN'    12 183.85  74.0      19.30    0.35     9.59        0
         'LEAD'    13 207.19  82.0      11.35    0.56     17.09       0
      'URANIUM'    14 238.03  92.0      18.95    0.32     10.50       0
     'LIQARGON'    17  39.95  18.0       1.40    14.0     83.70       0
          'G10'    18  13.88   7.1       1.70    19.4     53.05       0
     'TITANIUM'    19   47.9  22.0       4.54    3.56     27.51       0
        'ARGON'    20  39.95  18.0    1.78E-3 1.098E4   6.584E4       0 !gas
      'SILICON'    21  28.09  14.0       2.33   9.365     45.49       0
\END

The call to GSMATE format is reflected in the format of the ARRAY MATERIAL_LIST. In the above example, the material ALUMINUM is defined with material number 9, atomic wt and number equal to 26.98, 13.0 density 2.7 gm/cc and radiation length 8.90cm. It has an absorption length of 39.4 cm. No extra user words are added.