Abstract
Comparisons between new 21 cm redshifts and older data, especially older 300 foot telescope data, were used in conjunction with Paper III of this series to demonstrate the presence of systematic deviations in the older data. This paper summarizes the evaluation of the older data including corrections for a linear velocity approximation, present in reduction software used. The corrections do not alter the pattern of deviations significantly. Quality evaluations for the older data indicate that the accuracy of the data has been underestimated.
