size - number of atoms in the atom selection
X/Y/Z - 3 eigenvalues of the shape tensor
X/Y/Z diff - the difference of the corresponding eigenvale between different
System Message: ERROR/3 (/home/schwitrs/bit.niddk.nih.gov/xplor-nih/doc/3.8/headerHelp/Shape.txt, line 8)
Unexpected indentation.