Processing of Atomic and Molecuar data stored in "Janev" format: logarithmic polynomial fits introduced in [R.K. Janev et al. Elementary Processes in Hydrogen-Helium Plasmas (Springer 1987)] . See Chapter 9 of this document. This is a legacy format which was used in the EIRENE code . E.g. data sets HYDHEL, AMJUEL, METHANE, H2vibr. Description of the module.