Computes spectral slope values using staRdom::abs_fit_slope(), including interpolation,
absorption calculation, and QA/QC flagging for missing wavelengths.
Value
A vector of spectral slope values, one per sample in the abslist.
If the slope cannot be calculated, the function returns "DATA04".
Examples
S275_295 <- get_abs_slope(example_abs, lim = c(275, 295))
