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The mean $B$ values for the galaxies selected by optical morphology are significantly different; elliptical galaxies resemble the blazar and radio galaxy distributions, with a mean covariance amplitude of $168\pm316$. Spiral galaxies have much lower $B$ values, however, with a larger spread and a mean close to zero ($12\pm359$). The K-S test applied to spiral galaxies and the blazar distribution (matching the spiral redshift range) is inconsistent at the 2.7$\sigma$ level. While the means for both are much closer, it should be noted that a K-S test is also inconsistent between the {\em elliptical} galaxy $B$ distribution and the blazars. This is more puzzling, since blazar hosts are thought to be almost without exception elliptical galaxies \citep{urr95}.   \begin{deluxetable*}{lrccl}  \tabletypesize{\scriptsize}  \tablecaption{Measured spatial covariance amplitudes from SDSS imaging \label{tbl-bgtable}}  \tablewidth{0pt}  \tablehead{  \colhead{Galaxy \begin{table}  \begin{tabular}{|l|r|c|c|l|}  \textbf{Galaxy  sample} & \colhead{$N$} \textbf{$N$}  & \colhead{$\langle \textbf{$\langle  B_g \rangle$} & \colhead{$\sigma_{Bg}$} &  \colhead{Reference} \textbf{$\sigma_{Bg}$} &\textbf{Reference}  \\ \colhead{} -  & \colhead{} -  & \colhead{[Mpc$^{1.77}]$} [Mpc$^{1.77}]$  & \colhead{[Mpc$^{1.77}]$} [Mpc$^{1.77}]$  & \colhead{}  }  \startdata - \\  \hline  Blazars & 757 & 121 & 436 & 1,2,3 \\  \hspace{10 pt} BL~Lac & 528 & 111 & 257 & \\  \hspace{10 pt} FSRQ & 98 & 116 & 278 & \\  \hspace{10 pt} Uncertain & 131 & 143 & 859 & \\  Radio galaxies & 283 & 131 & 410 & 4 \\  \hspace{10 pt} FR I & 55 & 138 & 598 & \\  \hspace{10 pt} FR II & 184 & 133 & 372 & \\  \hspace{10 pt} Compact & 44 & 111 & 258 & \\  Radio galaxies (optical counterparts) & 258 & 269 & 357 & 5 \\  \hspace{10 pt} Complex & 111 & 321 & 357 & \\  \hspace{10 pt} Compact & 37 & 282 & 434 & \\  \hspace{10 pt} Resolved & 110 & 211 & 323 & \\  Optical galaxies & 624 & 125 & 335 & 6 \\  \hspace{10 pt} Elliptical & 540 & 145 & 329 & \\  \hspace{10 pt} Spiral & 84 & $-2$ & 348 & \\  \enddata  \tablerefs{(1) \hline  \end{tabular}  \caption{   \textbf{\label{tbl-bgtable} Measured spatial covariance amplitudes from SDSS imaging.}  (1)  - \citet{mas09}; (2) - \citet{plo10}; (3) - \citet{hor08}; (4) - \citet{gen08}; (5) - \citet{kim08}; (6) - \citet{lin11}}  \end{deluxetable*} \citet{lin11}  }  \end{table}