Spectral seawater absorption and total
 scattering coefficients in units of /m.
 Absorption from Pope and Fry 1997,
 Scattering from Smith and Baker 1981,
 and backscatter:total scatter ratio from  
 Morel 1974.  Format i5,f15.4,f10.4
  400         0.0066    0.0076
  425         0.0048    0.0058
  450         0.0092    0.0045
  475         0.0114    0.0036
  500         0.0204    0.0029
  525         0.0417    0.0023
  550         0.0565    0.0019
  575         0.0772    0.0017
  600         0.2224    0.0014
  625         0.2834    0.0012
  650         0.3400    0.0010
  675         0.4480    0.0008
  700         0.6240    0.0007