Algorithm 1: Spectra mix

Data: C    set of two PGs to mix     s, sr    sample and reference spectra     inttime    list of individual integration times     N    number of samples to be simulated   Result: sm    spectra mix of binary combination C   $\phantom{(}$   ${\mathbf{p}}_{\mathbf{c}}\leftarrow get\_proportion\left(\mathbf{N}\right)$          //$\phantom{(}$ compute shares per component for every mixture   ${\mathbf{a}}_{\mathbf{c}}\leftarrow get\_inttime\_factors(\mathbf{inttime},{\mathbf{p}}_{\mathbf{c}})$          //$\phantom{(}$ calculate integration time factors   ${\mathbf{s}}_{\mathbf{c}},{\mathbf{sr}}_{\mathbf{c}}\leftarrow get\_spectra\_sample(\mathbf{s},\mathbf{sr},\mathbf{N})$          //$\phantom{(}$ choose randomly component spectra   ${\mathbf{sm}}_{\mathbf{c}}\leftarrow get\_spectra\_mix({\mathbf{s}}_{\mathbf{c}},{\mathbf{sr}}_{\mathbf{c}},{\mathbf{a}}_{\mathbf{c}},{\mathbf{p}}_{\mathbf{c}})$          //$\phantom{(}$ compute mix spectra $\phantom{(}$