  Under the assumption that the concordance Lambda cold dark matter (CDM) model
is the correct model, we test the cosmic microwave background (CMB) anisotropy
data for systematic effects by examining the band pass temperature residuals
with respect to this model. Residuals are plotted as a function of l, galactic
latitude, frequency, calibration source, instrument type and several other
variables that may be associated with potential systematic effects. Linear
fitting to the residuals indicates no significant identifiable systematic
errors associated with these variables, except for the case of galactic
latitude. We find evidence for a trend associated with the absolute galactic
latitude range at more than the 2-sigma level. This may be indicative of
galactic contamination and may require a 2% reduction in the normalisation of
low galactic latitude observations.
