#name   Format    Air; 76 % N, 23 % O  1 % Ar
Air 	2
#   rho is from PDG. JIS data 1.225e-3   refractive index from PDG
#  Elem	 rho(g/cm^3)	Gas/Solid(1/0) refr.index               Birks corr.
#                                     (for gas, (n-1)*10^6)

3         1.205e-3		  1    289                       0  0  0
# 	Z	A  	N
	7	14	0.76
	8	16	0.23
	18	40	0.01
#  ⟨Z/A⟩   I[eV]   a       k      x0    x1     Cbar  delta0
 0.49919   85.7  0.1091  3.3994  1.7418  4.2759  10.5961 0.00
