Number of stars in the database that have been detected in X-ray and UV observations and have flux measurements. The histogram shows the distribution of XUV detections according to stellar spectral type. For each spectral type there are 3 bars. The left bar shows the number of targets with HST data (dark grey) and those with only Spitzer data (light grey). The middle bar is the number of X-ray detected targets (black). The right bar is targets with an NUV detection (striped). The left-hand bar can be used to find the total number of targets in a given spectral type. The star with unknown spectral type is Kepler-14 which is listed as an eclipsing binary in SIMBAD and only has a Gaia photometry value available for one of the stars.