= {
"Initial refinement level. Specify one of: a single number, a list "
"representing [r, theta, perp], or such a list for every block in the "
"domain. Here 'r' is the radial direction normal to the inner and "
"outer boundaries, 'theta' is the periodic direction, and 'perp' is "
"the third direction. Note that for spherical shell block groups "
"('InnerSphereA', 'InnerSphereB', and 'OuterSphere'), you must instead "
"specify refinement as a single value representing radial refinement."}