From top to bottom: 2D maps of ESPRESSO’s resolving power for its three instrument modes UHR, HR, and MR. For each mode, the two CCDs are represented (top = red chip, bottom = blue chip). The y-axis does not represent the physical diffraction order number but denotes a continuous (DRS-internal) numbering of every individually extracted slice of each order sorted by increasing wavelength (1 = bluest wavelengths). The white dots show the location of the thorium lines used for the computation of the resolving power. Since in the MR mode the two slices of a given order are merged together by the extraction algorithm, only half the number of orders are present. Their lines have been graphically increased in width to represent the same detector area as the two other modes.