In the lower picture the frame S is moving with velocity − v in the frame S′ at rest. The worldline of clock W is the ct -axis (slanted to the left), the worldline of W′ 1 is the vertical ct ′-axis, and the worldline of W′ 2 is the vertical through event C, with ct ′-coordinate D. The invariant hyperbola through event C scales the time interval OC to OA, which is shorter than OD ; also, B is constructed (similar to D in the upper pictures) as simultaneous to A in S, at x = 0. The result OB > OC corresponds again to above.