(a) Normalised transmission images from the hyperspectral ptychographic reconstruction. From left to right the energy is increasing from 8227 to 8461 eV in 26 eV steps. The red crosses show energy-transmission profiles through 1.5 µm of Ni (b) and 5 µm of Cu (c). The blue lines in (b,c) show the theoretical values from Henke48 convoluted with the detector response and energy binning. The blue vertical bands mark the energy bins used later for the edge subtraction.