Examples for the implementation of line interlopers

Thesetwo notebooks shows how to predict GCspectro power spectrum multipoles with the inclusion of the auto-spectrum of line interlopers, as done in the branches GCsp_clustering_of_interlopers and GCsp_clustering_of_interlopers_1. The main difference is not on the specific recipe for line interlopers, but in the overall structure of the spectroscopic module, precisely whether we want an approach bottom up, with low-level classes instantiated directly by the user and passed to higher-level ones (for this we need an additional top-level class whose goal is to combine in a weighted sum the power spectra fo different species according to their fractions), or a more "traditional" approach, where LegendreMultipoles takes care of predicting the contamined model by itself