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HAPI2 Discrete Integral Transform plugin implementing the fast algorythm for computing the absorption spectra.
Detailed description of the algorythm is given in: van den Bekerom DCM, Pannier E. A discrete integral transform for rapid spectral synthesis. J Quant Spectrosc Radiat Transf 2021;261:107476. https://doi.org/10.1016/j.jqsrt.2020.107476.
Based on the original code by D. van den Bekerom: https://github.com/dcmvdbekerom/discrete-integral-transform/