I believe the damping parameters are accurate with two digits.

There is a problem that it is not enough.

Taking parameters from #92 (s6=0.418, a2=5.65), the dispersion energy for example.xyz is -1.5172415429713E-02. With two digits (s6=0.42, a2=5.7), the dispersion energy is -1.4655518783476E-02. The difference is ~3.5 % and that is huge.

The output:

build % app/s-dftd3 ../app/example.xyz --bj-param 0.418 0.0 0.0 5.65
-----------------------------------
 s i m p l e   D F T - D 3  v1.1.1
-----------------------------------

Rational (Becke-Johnson) damping: D3(BJ)
---------------------
  s6         0.4180
  s8         0.0000
  s9         0.0000
  a1         0.0000
  a2         5.6500
 alp        14.0000
--------------------

Dispersion energy:      -1.5172415429713E-02 Eh

[Info] Dispersion energy written to .EDISP
 build % app/s-dftd3 ../app/example.xyz --bj-param 0.42 0.0 0.0 5.7
-----------------------------------
 s i m p l e   D F T - D 3  v1.1.1
-----------------------------------

Rational (Becke-Johnson) damping: D3(BJ)
---------------------
  s6         0.4200
  s8         0.0000
  s9         0.0000
  a1         0.0000
  a2         5.7000
 alp        14.0000
--------------------

Dispersion energy:      -1.4655518783476E-02 Eh

More functionals from 10.1002/jcc.23391 #94

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