DSS images for the star clusters sample (6﹩\mathop{.}\limits^{{\rm{^{\prime} }}}﹩5 × 6﹩\mathop{.}\limits^{{\rm{^{\prime} }}}﹩5). From upper left to bottom right: NGC 1711, NGC 1718, NGC 1801, NGC 1806, NGC 1818, NGC 1849, NGC 1866, NGC 1916, SL 505, NGC 2100, and NGC 2136 and NGC 2137. The observed regions are indicated in yellow, showing all slit positions (width = 2﹩\mathop{.}\limits^{\unicode{x02033}}﹩0 length = 5﹩\mathop{.}\limits^{{\rm{^{\prime} }}}﹩5). North, east (black), and the zenith (red) direction are indicated in each panel.