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The image provides the size requirements for icons for iOS 6 and iOS 7, which are:
Icon-Small-29pt for iPad with settings iOS 5-7: 1x - 29 pt, 2x - 58 pt
Icon-Small-29pt for iPhone with settings Spotlight - iOS 5,6; iOS 5-7: 1x - 29, 2x - 58.
Icon-Small-40pt for iPad Spotlight iOS 7: 1x - 40, 2x - 80
Icon-Small-40pt for iPhone Spotlight iOS 7: 2x - 80
Icon-Small-50pt for iPad Spotlight iOS 5.6: 1x - 50, 2x - 100
Icon-57pt for iPhone App iOS 5,6: 1x - 57, 2x - 114
Icon-72pt for iPad App iOS 5.6: 1x - 72, 2x - 144
Icon-60pt for iPhone App iOS 7: 2x - 120
Icon-76pt for iPad App iOS 7: 1x - 76, 2x - 152