SED of RXJ1131 over far-infrared to radio wavelengths, based on photometry from Herschel (dark red), LABOCA (red), and VLA (blue; see Stacey et al. 2018), and 1.3 mm fluxes (orange) from PdBI Leung et al. (2017) PdBI and ALMA (Paraficz et al. 2018, this work). Individual photometry points are summed up over all quasar images, and are not corrected for lensing magnification. The observed rest-frame 1.3 mm flux varies by a factor of ≈3 between different epochs. We show the best-fit modified-black body fits including the 2015 February (dashed) and 2015 July (dotted) PdBI and ALMA photometry; the inferred far-infrared luminosity and star-formation rates differ by a factor of ≈2.