Distribution in the sky of the different photometric detections of sub-structures in the Virgo region. The dotted horizontal line at Dec = −4° represents the rough southern limit of the SDSS imaging survey. There are also 3 SEGUE imaging stripes that cross the region at negative declinations as shown by the other dotted lines. Labels correspond to the following references: N02, Newberg et al. (2002); V06, Vivas & Zinn (2006); D06, Duffau et al. (2006); J08, Jurić et al. (2008); K-A, K-B and K-C, Keller et al. (2008, 2009); K-VOD, K-VES, K-160 and K-180, Keller (2010). The small squares represent the fields observed by Jerjen et al. (2013); the one at (RA, Dec) coincides with the location of Vir Z (Walsh et al. 2009). The × symbol shows the densest part of the overdensity as seen in RRLS in the QUEST survey.