Table 4: M 15 surveys.
  Distance from Filters
  the center  
Durrell & Harris (1993)  $7^\prime $ NW $B,\ V$
De Marchi & Paresce (1995)   $4\hbox {$.\mkern -4mu^\prime $ }6$ NW $V,\ I$
This work  $7^\prime $ NE $J,\ H$


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