Computer code calculating fission track age nodes for c-axis projected tracks

The computer code LsqTrack_c_4_1.m deconvolves fission track length histograms with the aim to derive multiple ages for each histogram. The tracks should be c-axis projected (Donelick, 1999). The relation between c-axis projected mean track length to surface track density is updated relatively to ealier versions following Donelick (pers. com). The mathematics is an extension of theory given in Jensen and Hansen (2021). The programming language is GNU Octave (Eaton et al., 2020) compatible with MatLab.