\begin{table}%t1 \par \caption{\label{Error_norms_conv}Variation in the typical orders of magnitude of error norms with the convolution length $K$ for an unlensed CMB map simulated using NFFT.} %\centerline { \begin{tabular}{cccccc} \hline \hline Oversampling& Convolution& nside& $l_{\max}$& Maximum& rms \\ factor& length& & & error& error \\ $\left(\sigma\right)$& $\left(K\right)$& & & $\left(E_{\infty}\right)$& $\left(E_{2}\right)$ \\ \hline\\[-3.2mm] 2& 4& 1024& 2048& ${\sim} 10^{-8}$& ${\sim} 10^{-8}$ \\ %\hline 2& 6& 1024& 2048& ${\sim} 10^{-11}$& ${\sim} 10^{-12}$ \\ %\hline 2& 8& 1024& 2048& ${\sim} 10^{-11}$& ${\sim} 10^{-13}$ \\ \hline \end{tabular}} \medskip \par $E_{2}$ and $E_{\infty}$ are the quadratic norm and maximum(relative) norm, respectively. \end{table}