Different diagrams that are used in previous works to separate transition disk systems from the full disk sample. (a) Selection criteria that were used by Merín et al. (2010). Systems that fall in the bottom dashed box are classified as transition disks and systems that fall in the top dashed box are systems with small excess in the IRAC bands. (b) Selection criteria used by Cieza et al. (2010). The dashed lines separate the transition disks. (c) Selection criteria from Fang et al. (2013). Systems that fall in the dashed region are transition disks. (d) Selection criteria from Muzerolle et al. (2010). Systems in the left dashed box are classified as weak-excess sources and systems that lie in the right dashed box are transition disks. Almost all of our transition disk candidates fulfill the selection criteria from the literature.