base.rea
2 			spatial dimension
1 			number of fields
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Y 			cYlinder
3 -24 1 		nelr,nel_theta,nelz
.0 .0 			x0,y0 - center of cylinder
ccbb 			descriptors: c-cyl, o-oct, b-box (1 character + space)
.5 .55 .7 .8 		r0 r1 ... r_nelr
0 1 1 			theta0/2pi theta1/2pi ratio
E  ,E  ,E  ,E  ,  	bc’s (3 characters + comma)