are also very reasonable, although there may be systematic contributions to these residuals attributable to faults in the facility: a likelihood further discussed in §3.3. As an independent test,these photo metric corrections were applied to the early
RCT direct imaging data of SN 2011fe, obtained at average airmass of 1.9. The results shown in Figure 8 are in excellent agreement with data from various observatories of this nearby Type Ia supernova.