Integrated direct-photon yield in the \pt range $1 < \pt < 5$ \GeVc (or $1 < \pt < 3$ \GeVc) in Pb--Pb collisions at \fivenn and \twosevensixnn , in \AuAu collisions at \twoHnn as measured by the PHENIX  and STAR  collaborations, and in \pp collisions at \twoH . The data are compared to predictions from a state-of-the-art model . The error bars and boxes represent the statistical and systematicuncertainties of the data along the y-axis, respectively. The horizontal width of the boxes shows the total uncertainty of the measured $\frac{{\rm d}N_{\rm ch}}{{\rm d}\eta}|_{\eta = 0}$ .