Gluons drawn in the styles REG, FLIPPED, CURLY, FLIPPEDCURLY, FLAT, FLIPPEDFLAT and SQUASHED commence and conclude on one <#2#>edge<#2#> of the particle line as opposed to CENTRAL gluons which begin and end near the middle of the line. This can be seen clearly in section 2.10.1. On occasion one wishes to draw a gluon which is central on one side and non-central and the other. To centralize a gluon the <#3#>gluoncap<#3#> modifier is invoked. Similarly gluon verticies may be capped via <#4#>vertexcap<#4#> and <#5#>vertexcaps<#5#>.