Overview of all the experimental CO photodesorption studies, the colour code refers to the deposition and photolysis temperature (with the exception of ö1, 27 K/16 K). Most studies are performed with a discharge lamp, while Fayolle et al. (2011) use synchrotron irradiation as VUV source (f1 = 10.2 eV, f2 = 11.2 eV, f3 = 9.2 eV, f4 = 8.2 eV). Flux calibration; filled symbols: NIST photodiode; empty symbols: actinometry. Detection technique; triangles: RAIRS; circles: FTIR; square: LD TOF-MS. The labelling of Chen et al. (2014): c1, c2, c3, and c4 refer to different running conditions of the discharge lamp resulting in different SEDs, while the labelling of the present study refers to the direct measurement (p1) or the indirect measurement (p2) based on the SED of the lamp and wavelength dependence of CO photodesorption from Fayolle et al. (2011) (see Fig. 4).