# Fraunhofer lines / 1 nm
H= 396.8 # calcium
g= 422.4 # calcium
G= 430.8 # calcium
f= 432.6 # iron
G'= 434  # H gamma, but rather some iron in the Sun
e= 438.4 # iron
d= 466.8 # iron
F= 486.1  # H beta  seems to have n=154 
b4= 516.7  # 
b= 517.2  # magnesium triplet, iron b3 is 0.1 nm less then b2
b1= 518.4  # 
E= 527  # iron dublet
D= 589.3  # sodium resonance line  
C= 656.3  # H alpha
B= 686.7  # terrestrial oxygen
A= 760.8  # terr. O