Figure 3

Three water bubbles: at the left, (a) “xz” plane, (b) “yz” plane and (c) “xy” plane, and at the right, the irradiance contour in an “xz” plane with several images in gray levels (arbitrary Y scale).
Three water bubbles: at the left, (a) “xz” plane, (b) “yz” plane and (c) “xy” plane, and at the right, the irradiance contour in an “xz” plane with several images in gray levels (arbitrary Y scale).