In libamtrack, there are currently seven parametrizations of the maximal distance electrons travel from the center of a particle track as a function of the primary particle's energy. They are referred to using sequential positive integer numbers (see details).
er.model  | description | 
| 1 | A simple test function (constant range) | 
| 2 | Parametrization proposed by Butts and Katz (Butts & Katz, 1972) | 
| 3 | Parametrization proposed by M. Waligorski (Waligorski, 1985) | 
| 4 | Parametrization proposed by O. Geiss (Geiss, 1997) | 
| 5 | Parametrization proposed by M. Scholz (Scholz, 1997) | 
| 6 | Parametrization proposed by J. Edmund (Edmund et al., 2007) | 
| 7 | Parametrization proposed by Tabata (Tabata, 1972) | 
More information on the electron-range models, especially the explicit formulas used, valid energy ranges and references to literature are found in the libamtrack reference manual (http://libamtrack.dkfz.org/libamtrack/images/3/31/LibamtrackReferenceManual.pdf).
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