Orbital phase coverage for the observations of 55 Cnc b (panel a), 55 Cnc e (panel b), υ And b (panel c), and τ Boo b (panel d). The numbers representing each date are indicted in Col. 1 of Table A.1. We note that 55 Cnc e is a transiting exoplanet. For 55 Cnc e, only a few planetary rotations are shown. For 55 Cne e, the entire orbit is covered by the observations, whereas the orbital coverage is low for 55 Cnc b. Approximately 40 and 25% of the orbits of υ And b and τ Boo b are covered, respectively. The τ Boo observations with the tentative detections (Sect. 5.1; obs #1 and #6) are displayed as large dark-blue rectangles in panel d.