Temperature fluctuation patterns for photons that have exited a local box, caused by an individual merger event with different orientation angles, γ = 0. The amplitude and physical scale of the fluctuations can be found by using Eq. (5). Note that the average temperature fluctuation always vanishes, by merit of the tracelessness of the GWM tensor. The projected scale of the patterns is related to the size of the GWM shell at the time the surface of photons crosses the co-ordinates of the source, denoted by the dashed grey line.