  We evaluate the accuracy of traditional estimators often used to extract N to
Delta quadrupole ratios from cross section angular distributions for pion
electroproduction. We find that neither M1+ dominance nor sp truncation is
sufficiently accurate for this purpose. Truncation errors are especially large
for EMR, for which it is also essential to perform Rosenbluth separation. The
accuracy of similar truncated Legendre analyses for E0+, S0+, and especially
M1- is even worse.
