Fig. 5.

Testing the accuracy of photograph co-registration. (a) Photograph 250 (green) overlaid on Photograph 1 (purple). (b) Photograph 250 co-registered and overlaid on Photograph 1. The area highlighted in orange shows movement of Photograph 250 from its original to new location. Graphs showing (c) x-translation and (d) y-translation calculated by photograph co-registration, the corresponding least squares line of best fit (blue line) and expected positions based on stage translation speed (red line).