Part 7/9:
The apparent visibility of peaks taller than this predicted obscuration indicates the surface is not flat. In particular, the position of the mountains relative to the horizon matches what the globe model expects, considering the observer's elevation.
The tallest mountain in the image, Masana (~1,365 m), is visible, consistent with the calculations. The lower peaks, like the leftmost one (just over 800 m), should be below the horizon if Earth were flat but are visible in the photo, which could only occur on a curved surface.