2MASS J16042165-2130284 2015-06-09 IRDIS-K12 RDI-PCA reductions using the different reference libraries. The reduction with the best S/N is shown for each library. Each image is labelled with the selection metric of the reference library (top right), the number of PCs used (bottom right), and the mean S/N of the disc (bottom left). The region in which the S/N was measured is indicated by the red dashed lines.