Illustration of the shape and size of one cross-correlated dataframe. Each row is a sample and represents a cross-correlated spaxel (CC spaxel). The RV steps are called features, and the elements of the last column Y are the categorical labelling indicating the presence of a planet or molecule of interest in the spectra. One whole cross-correlated dataframe as above is named a template channel; it results from the cross-correlation of the whole spectral dataset (i.e. all samples) with a unique template.