First optional function of RASSINE (intersect_all_continuum) for reducing spectral time series and stabilising the derived continuum. The anchor points of all the spectra are plotted (colour dots). The density is represented by the green curve. The detected clusters are those with a density higher than the threshold (horizontal blue line) and are represented by the black boxes. This step rejects spurious anchor points such as selected around 6040 Å.