#    International Tables for Crystallography
#      Volume C
#      Mathematical, Physical and Chemical Tables
#      Edited by A.J.C. Wilson
#      Kluwer Academic Publishers
#      Dordrecht/Boston/London
#      1992
#
#    Table 6.1.1.4 (pp. 500-502)
#      Coefficients for analytical approximation to the scattering factors
#      of Tables 6.1.1.1 and 6.1.1.3
#
#    [ Table 6.1.1.4 is a reprint of Table 2.2B, pp. 99-101,
#      International Tables for X-ray Crystallography, Volume IV,
#      The Kynoch Press: Birmingham, England, 1974.
#      There is just one difference, see "Tl3+".
#    ]
#             f0[k] = c + [SUM a_i*EXP(-b_i*(k^2)) ]
#UD                i=1,5
#UD  a1  a2  a3  a4  a5  c  b1  b2  b3  b4  b5  excl_vol
H        0.493002   0.322912   0.140191   0.040810   0.0     0.003038   10.5109   26.1257     3.14236   57.7997     1.0      5.15
HE       0.489918   0.262003   0.196767   0.049879   0.0     0.001305   20.6593    7.74039   49.5519     2.20159    1.0      5.15
C        2.31000    1.02000    1.58860    0.865000   0.0     0.215600   20.8439   10.2075     0.568700  51.6512     1.0      16.44
N       12.2126     3.13220    2.01250    1.16630    0.0   -11.529       0.005700  9.89330   28.9975     0.582600   1.0      2.49
O        3.04850    2.28680    1.54630    0.867000   0.0     0.250800   13.2771    5.70110    0.323900  32.9089     1.0      9.13
NE       3.95530    3.11250    1.45460    1.12510    0.0     0.351500    8.40420   3.42620    0.230600  21.7184     1.0      9.
NA       4.76260    3.17360    1.26740    1.11280    0.0     0.676000    3.28500   8.84220    0.313600 129.424      1.0      9.
MG       5.42040    2.17350    1.22690    2.30730    0.0     0.858400    2.82750  79.2611     0.380800   7.19370    1.0      9.
P        6.43450    4.17910    1.78000    1.49080    0.0     1.11490     1.90670  27.1570     0.526000  68.1645     1.0      5.73
S        6.90530    5.20340    1.43790    1.58630    0.0     0.866900    1.46790  22.2151     0.253600  56.1720     1.0      19.86
CL      18.2915     7.20840    6.53370    2.33860    0.0   -16.378       0.00660   1.1717    19.5424    60.4486     1.0      9.
CA      15.6348     7.95180    8.43720    0.853700   0.0   -14.875      -0.00740   0.608900  10.3116    25.9905     1.0      9.
FE      11.0424     7.37400    4.13460    0.439900   0.0     1.00970     4.65380   0.305300  12.0546    31.2809     1.0      9.
CO      11.2296     7.38830    4.73930    0.71080    0.0     0.93240     4.12310   0.272600  10.2443    25.6466     1.0      9.
ZN      11.9719     7.38620    6.46680    1.39400    0.0     0.780700    2.99460   0.203100   7.08260   18.0995     1.0      9.
SE      17.0006     5.81960    3.97310    4.35430    0.0     2.84090     2.40980   0.272600   15.2372   43.8163     1.0      9.
AU      16.8819    18.5913    25.5582     5.86000    0.0     12.0658     0.461100  8.62160     1.48260  36.3956     1.0      19.86