++++ Executed the following command at host hex.lmb.internal on Sun Sep 19 14:07:26 2021
  `which relion_helix_toolbox` --i postprocess.mrc --o hh_postprocess.mrc --angpix 0.73 --impose --rise 4.86879 --twist -2.88485 --cyl_outer_diameter 140 --z_percentage 0.15