#name   Format   Wood
wood 1
#  ~ cellulose (C_6 H_10 O_5)n + 15% water (15.1% in this table)
#  Elem  rho(g/cm^3)    Gas/Solid(1/0)  refl.index Birks c

3         0.4          0              0        0 0 0
#       Z       A       N
        6       12     10
        1       1      22
        8       16     11   
