Potential targets for future Doppler imaging: the full catalogue of measurements of substellar rotation and variability. The three panels show the spectral types of objects with measured rotation periods a), photometric variability semi-amplitude in any bandpass b), and v sin ic). Upper limits to v sin i, and lower limits on periods, are indicated by triangles. Solid points are field objects, empty points are young objects. The “×” symbol in panel c) indicates the young, giant exoplanet β Pic b (Snellen et al. 2014). See Table 2 for the full compilation and references. Note that the sample is quite incomplete for objects later than ~L5.