These effects are specified by the first token in the central label, which thus has the form: |<#947#>|;SPMlt;tok;SPMgt;<#267#>label<#267#>|<#947#>| where ;SPMlt;tok;SPMgt; may be one of ...
When none of these occurs then the default of |_| is assumed.
If the label itself starts with one of these characters then
specify |_| explicitly, or enclose the label within a group |<#273#>...<#273#>|.
See
2 OPTIONS for the central Arrow:
the position of the Arrow is determined by ``nudging'' (see below) e.g. |<#278#>^;SPMlt;num;SPMgt;label<#278#>|, where the actual dimen is |;SPMlt;num;SPMgt;@|
2
2