Fraction of stars observed by K2 as a function of rank order (row number in the list of targets proposed by K2GAP). The sharp fall in fraction marks the rank order up to which the sample is complete. For most campaigns, the completeness is typically high, greater than 0.97. C3 and C12 have slightly lower completeness, 0.85 and 0.91 respectively. For C3 the completeness is low due to a roll angle error, while for C12 it is due to extra targets proposed in the broken CCD module. C13 also has slightly lower completeness due to extra targets proposed in the broken CCD module. C17 shows a two-step fall in the fraction, the cause of which is not clear.