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Figure 7
Left: schematic view of the waveguide (WG) tilt scan, performed around axes set to coincide with the channel entrance. Middle: two example far-field images of the beam from a 50 µm × 50 nm waveguide, recorded at different φ-tilt angles (detector distance of 2.4 m). The dashed lines indicate where the vertical projections of these images are located in the tilt angle plot (right), composed of projections of images recorded within a φ-tilt angle range of ±0.1°. Note the logarithmic intensity scaling in all images.

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