The reconstruction results of two horizontal slices for the chlorella data, window: [0.003, 0.015] µm−1. The top row is for the 213th slice while the bottom row is for the 331st slice. The red line in (a) indicates the position of intensity profiles in Fig. 7. (a) fFBP, (b) fFBP, PWLS, (c) fU-Net, (d) fU-Net, PWLS, (e) fFBP, (f) fFBP, PWLS, (g) fU-Net and (h) fU-Net, PWLS.