Timestamp-mod-timestamp plot. In the first three panels we show the different SONG campaigns of γ Cep, where we have divided each dataset into 24 hr intervals and have plotted these intervals (in hours) against the time from the start of that campaign. The blue points are data from the Tenerife node, and the orange points are data from the Delingha node. In the two last panels we have plotted the TESS data as green points, where this time we have divided the data into intervals of 13.7 d (i.e. the orbital period of TESS), and again we have plotted these intervals (in days) against the start of a campaign. In panel three, the start of the campaign is taken to be the start of the SONG campaign, clearly showing the overlap between the 2019 SONG and TESS data, whereas the start of the campaign (covering two sectors) in the last panel is taken as the start of sector 24.