Contrast improvement using RDI over ADI or ASDI, estimated from the S/N of recovered simulated companions from an IRDIS data set. The star-hopping RDI technique yields detections limits more than 2 mag fainter than ADI at 01 separation from the target star. The green line shows the case for a K1/K2 companion flux ratio of 10 and very similar algorithms for RDI and ASDI, except that the ASDI reduction is fine-tuned to minimize self-subtraction. The blue line similarly shows RDI−ADI difference for equal K1, K2 flux. The red line shows the RDI improvement against the best PCA-based ADI reduction for a K1/K2 flux ratio of 10. The LOCI and PCA reductions are described in Sect. 3.3.