Spectral energy distribution of ASXDF1100.053.1 in the observed frame. Red filled and open squares indicate the measured detections and upper limits, respectively, taken from this paper or from Ikarashi et al. (2017b). A solid black curve shows the best-fit SED obtained by our modelling using MAGPHYS in Sect. 3.1. A dashed blue curve shows the best-fit dust SED obtained by another modelling using modified black bodies with β = 1.8 including radio SED, which is presented in Sect. 3.1. The physical properties of the best-fit SED are not identical to the median values shown in Table 2.