X-ray luminosities of the Hyades as a function of the BP − RP color. The color coding is the same as in Fig. 5. From top to bottom, the dashed lines indicate activity levels of L_X/L_bol = −2, −3, −4, −5, −6, and −7 for sources located on the main sequence. The upper panel shows the best X-ray luminosity for the individual Hyades members, while the bottom panel compares the X-ray luminosities measured by different instruments or pointings for multiple detected sources. Detections of the same source are connected by a string.