Hydro - only have the qarray in Hydro sims:

q: 1D	q: 2D	q: 3D
rho, px, E	rho, px, py, E	rho, px, py, pz, E

MHD - in MHD, have both the qarray and the aux array (note that in addition to the aux arrays, EMF arrays are also initialized in MHD, and should be considered when making memory estimates (see)).

q: 1D, 2D, 3D	aux: 1D	aux: 2D	aux: 3D
rho, px, py, pz, Bx, By, Bz, E	No aux array in 1D	Bx, By	Bx, By, Bz