Scatter Plot from Scientific Research

Systematic evaluation of the Φ-dependent asymmetry A=({I}_{+{{rm{k}}}_{{rm{y}}}}-{I}_{-{{rm{k}}}_{{rm{y}}}})/({I}_{+{{rm{k}}}_{{rm{y}}}}+{I}_{-{{rm{k}}}_{{rm{y}}}})(regions of interest are indicated in c). The data points and the black line are extracted from experiment and theory, respectively (Methods). The asymmetry A changes sign when the surface-projected electric-field vector (double-headed arrow) is rotated through Φ = 0°, Φ = 90° and Φ = 180°. The error is determined by the standard deviation of the total counts per segment caused by the uncertainty in the position of the K1 point (Methods).

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