| update_mesh 
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             update_mesh, mesh, rt, zt  
          or update_mesh, mesh, rt, zt, ireg  
 
     updates the opaque MESH object to reflect a new RT, ZT, and  
     (optionally) IREG.  The boundary edges are recomputed and stored  
     in MESH, as well.  
builtin function, documented at i0/drat.i   line 1086  
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