Second generation Digitized Sky Survey (DSS-2; red filter) images. a) Image centered at α_J2000 = 16:38:00; δ_J2000 ~ −49:15:20 and covering a 2° × 2° field. Solid rectangles centered in NGC 6167 and NGC 6193 indicates areas surveyed with UBVI observations. Dotted circle around NGC 6167 and several dotted circles around NGC 6193 indicates the areas with H_α(on/off) data. b), c) Detailed images centered respectively at NGC 6193 and NGC 6167 showing main objects in each region and the adopted comparison fields. For the meaning of the symbols see in advance Fig. 4 caption.