= {
"Initial refinement level. Specify one of: a single number or a list "
"of single numbers for every block group in the domain, every block "
"name in the domain, or a mix of block groups and blocks. Each single "
"number represents the radial refinement for spherical shell blocks "
"and z refinement for cylindrical blocks.\n\nNote that the z direction "
"in cylinder blocks will roughly correspond to refinement in a "
"direction parallel to the axis of separation between the two objects. "
"Because filled cylinder blocks lie along the axis of separation but "
"hollow cylinder blocks wrap around it, refinement in z leads to "
"refinement in different spherical coordinate directions in the "
"global spherical coordinates. More specifically, z refinement in "
"filled cylinders (e.g. EAFilledCylinder) will roughly correspond to "
"radial refinement in global spherical coordinates, but in hollow "
"cylinders, it will behave more like angular refinement in global "
"spherical coordinates that is perpendicular to the cylinder's local "
"angular direction."}