DATA SETS 
coeff*.dat	Energies and coefficients of Biggs & Lighthill photoelectric cross section parameterisation
nrows.dat	Number of energy intervals for each Z in the parameterisation
ratio.dat	Z/A ratio

UNITS
Lower energy bounds are in keV.
Photoelectric cross-section coefficients are in cm^2 keV^(1-4)/g.

CREDITS
The values in this database are those originally published in the SAND-0070 report.

REFERENCES
F. Biggs andR. Lighthill, 'Analytical Approximation for X-ray Cross Sections III', SAND-0070 Report, 1988.