Total (major + minor, μ ≥ 1/10) merger fraction as a function of redshift. Dots are from the present work in the COSMOS field for M _⋆  ≥ 10¹¹  M_⊙ galaxies, diamonds are from Mármol-Queraltó et al. (2012) for massive galaxies, squares are from Newman et al. (2012) for M _⋆  ≥ 5 × 10¹⁰  M_⊙ galaxies, crosses are from Jogee et al. (2009) for M _⋆  ≥ 2.5 × 10¹⁰  M_⊙ galaxies by morphological criteria, and inverted triangles are from Lotz et al. (2011) for M _⋆  ≥ 10¹⁰  M_⊙ galaxies by morphological criteria. The dashed line is the least-squares best fit of a power-law function, f_m ∝ (1 + z)^0.6, to the total merger fraction data in the present work.