Extended Data Fig. 1: Analysis of the tip isotropy.
From: Imaging the energy gap modulations of the cuprate pair-density-wave state
a, Topography T(r) within 40 nm × 40 nm FOV. b, Real part of Fourier transform of T(r). c, Line profile ReT(q) along the line in the middle panel, representing nearly equal Bragg peak height (difference is less than 7%).
