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 aver- age 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.