Vertex object:

Unless the first character is |~|, signifying a ``switch'', then the whole of the braced material is taken as specifying the ;SPMlt;object;SPMgt; for each vertex. It will be typeset with a circular edge using |[o]...|, except when there is just a single token ;SPMlt;tok;SPMgt;. In this case it is dropped as |=0<#127#>|;SPMlt;tok;SPMgt;|<#127#>|, having zero size. An object can also be dropped at each vertex using the switch |~*<#128#>|...|<#128#>|, in which case it will be circular, with the current <#129#>objectmargin<#129#> applied.

The next example illustrates three different ways of specifying a |&cir#circ;| at the vertices.

#code130#

#math366#

( @@<#810#>65 @@ <#137#>@@<#137#>66 ~@~<#138#>@@<#138#>67 @##1~!<#778#>68 @ @<#140#>##1<#140#>@@@<#778#>70 @##1~!<#668#>@<#141#>##1<#141#>@ @ @@ <#143#>*=0<#143#>##1@@! @<#144#>##1<#144#>@@@<#668#>72 @ <#810#>

@@#1<#669#>@<#145#>73 vertex already specified, discarding unused tokens:#1<#145#><#669#> )

3