Table 4: Mean central optical emission strength for barred and unbarred disk galaxies.
1 2 3 4 5 6
Type SA SB SA SB All
      EW( $\rm H_{\alpha} + [N_{II}]$) EW( $\rm H_{\alpha} + [N_{II}]$) EW( $\rm H_{\alpha} + [N_{II}]$)
      ( $\hbox{\rm\AA}$) ( $\hbox{\rm\AA}$) ( $\hbox{\rm\AA}$)
S0 6 1 25.0 $\pm$ 25.0 59.76 29.9 $\pm$ 21.7
Sa 4 6 1.8 $\pm$ 1.8 13.0 $\pm$ 8.6 8.5 $\pm$ 5.3
Sab - 1 - 8.9 8.9
Sb 5 3 33.8 $\pm$ 13.0 34.1 $\pm$ 21.2 34.0 $\pm$ 10.4
Sbc  5 7 15.5 $\pm$ 5.4 40.8 $\pm$ 10.9 30.2 $\pm$ 7.5
Sc 3 4 43.9 $\pm$ 7.1 40.9 $\pm$ 2.9 42.2 $\pm$ 3.2
Sp 2 1 29.5 $\pm$ 8.4 6.35 21.8 $\pm$ 9.1

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