Effect of the cutout test on magnetic fields and inflow. Top: volume-weighted average magnetic field intensity in the CMZ in three different density regimes for three simulaitions: (i) the fiducial CHEM_MHD simulation; (ii) the test where we cut out the CMZ; (iii) and the test where we also reset the B field (Appendix D for description). The latter was run until 400 Myr to give time for dynamo processes and MRI to develop again. Bottom: mass accretion as a function of time from the CMZ inwards (R < 100 pc) for the three simulations. The vertical dashed line indicates the time at which we performed the cut-out.