a # 1 60 R ' z#center b;c                                               '
a # a,[1]  ' c#numblankcols z#b                                         '
a # a,[1]  ' z#(S0.5X_/c)`Oz                                            '
a # a,[1]  ' $0                                                         '
a # a,[1]  '"center is used by e.g. headeron.                           '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm. '
Lfx a