Mass plane diagram for components in the M33 X-7. Masses derived in this work are marked in red whereas gray points represent previously determined values from Orosz et al. (2007). The uncertainty in masses is shown as error bars. The solid lines represent loci of constant orbital inclination angle of 65° derived in this work. The dashed line corresponds to the inclination angle of 75° derived by Orosz et al. (2007).