[Nek5000-users] curved side in a block

[nek5000-users at lists.mcs.anl.gov]

Dear Users,

I'm trying to construct a 3D mesh which consist on a small portion of a 
sphere.

First, I've constructed a single element. Now I'm trying to curve the 
edges using the "midpoint" routine, but nothing happens. What is the 
problem?

This is my mesh:

    1500.00       500.000       0.00000       0.00000     
XFAC,YFAC,XZERO,YZERO
  **MESH DATA** 6 lines are X,Y,Z;X,Y,Z. Columns corners 1-4;5-8
          1         3         1 NEL,NDIM,NELV
       ELEMENT          1 [    1A]    GROUP     0
    144.3500       7.217500       8.838700       176.7750
   -144.3500      -7.217500       0.000000       0.000000
   -144.3500      -7.217500      -8.838700      -176.7750
    0.000000       0.000000       0.000000       0.000000
   -176.7750      -8.838700       0.000000       0.000000
   -176.7750      -8.838700      -12.50000      -250.0000
   ***** CURVED SIDE DATA *****
          8 Curved sides follow IEDGE,IEL,CURVE(I),I=1,5, CCURVE
   2  1   8.829300     -3.6572E+00   -8.057200E+00  0.000000E+00  
0.000000E+00 m
   4  1   176.5864     -63.1445E+00  -1.611432E+02  0.000000E+00  
0.000000E+00 m
   6  1   0.000000     -1.1335E+01    5.269500E+00  0.000000E+00  
0.000000E+00 m
   8  1   0.000000     -2.2670E+02    1.053902E+02  0.000000E+00  
0.000000E+00 m
   9  1   73.14450     -1.7658E+02   -1.611443E+02  0.000000E+00  
0.000000E+00 m
  10  1   3.657200     -8.8293E+00   -8.057200E+00  0.000000E+00  
0.000000E+00 m
  11  1   11.33500     0.00000E+00    5.269500E+00  0.000000E+00  
0.000000E+00 m
  12  1   226.7000     0.00000E+00    1.053902E+02  0.000000E+00  
0.000000E+00 m

In 'CURVED SIDE DATA':
Edge Element x y z dummy dummy m
(x,y,z represent the coordinates of the mid point of the edge)

Thank you in advance.