Table 2: Major diameter statistics. The first two columns give the samples and the number of galaxies. The next three columns give the mean value, standard deviation ($\pm $sd), and standard error ($\pm $se) of the galaxy samples for $a \geq 1\hbox {$^\prime $ }$, $a \geq 45\hbox {$^{\prime \prime }$ }$, $a \geq 30\hbox {$^{\prime \prime }$ }$, and all. The last column gives the cluster position angle (cPA) in the galactic coordinate system. The cPA is estimated using the least-square fit method (see Fig. 1c).
Samples N Mean $\pm $sd $\pm $se cPA

$a \geq 1\hbox {$^\prime $ }$
52 1.50$^\prime$ 23 $^{\prime\prime}$ 3.9 $^{\prime\prime}$ 3$^\circ$
$a \geq 45\hbox {$^{\prime \prime }$ }$ 126 69 $^{\prime\prime}$ 26 $^{\prime\prime}$ 2.3 $^{\prime\prime}$ 7$^\circ$
$a \geq 30\hbox {$^{\prime \prime }$ }$ 298 48 $^{\prime\prime}$ 25 $^{\prime\prime}$ 1.4 $^{\prime\prime}$ 22$^\circ$
all 366 42 $^{\prime\prime}$ 25 $^{\prime\prime}$ 1.3 $^{\prime\prime}$ 18$^\circ$

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