1. no Arrow

This is determined by special values for ;SPMlt;tok;SPMgt; as the first (or only) character in the central label, as in the above description of the standard options.

#defs1379#

The central Arrow is omitted, leaving symmetrically placed curved connections with arrowheads at the specified ends. A label can be placed where the Arrow would have been.

If a special arrowhead is specified using |~'<#384#>..<#384#>| (see Extra Options~2, below) then this will be used instead of the standard |<#385#>;SPMgt;<#385#>|.

#code387#

#math457#

#tex2html_wrap_indisplay1758#

#code395#

#math458#

#tex2html_wrap_indisplay1760#