Maps of rotation measure (RM) in units of rad m⁻² obtained within the full length of the simulated cube for cases A and B with two amounts of ionization rates (ζ, see encapsulated panels on the left). The LOS changes along the x or y or z axes going from left to right, respectively. The dynamic range of the color bars is only positive when the integration axis is along the mean magnetic-field orientation (central panels in the first two rows from the top and right panels in the two bottom rows).