Default positions:

These set up default values for the parameters which specify the position of each component as well as the flags to indicate what type of 2-cell is to be typeset.

#defs1128#

|@| means to calculate from the value in |6|, see |@cell@@@|.

( @@<#914#>6=<#137#>3.5<#137#>5=<#138#>@<#138#>7=<#139#>@<#139#>8=<#140#>@<#140#>3=<#141#>f<#141#>77 @cell@ <#914#> @@<#915#>6=<#142#>7<#142#>5=<#143#>@<#143#>7=<#144#>@<#144#>8=<#145#>@<#145#>3=<#146#>o<#146#>78 @cell@ <#915#> @@<#916#>6=<#147#>-7<#147#>5=<#148#>@<#148#>7=<#149#>@<#149#>8=<#150#>@<#150#>3=<#151#>o<#151#>79 @cell@ <#916#> @@<#917#>6=<#152#>3.5<#152#>5=<#153#>@<#153#>7=<#154#>@<#154#>8=<#155#>@<#155#>3=<#156#>t<#156#>80 @cell@ <#917#> )

This collects together all the relevant data, and resolves the default positions.

( @@cell@@@<#1095#>81 66=<#157#><#157#> @7@6@ 3t@=@ 3o@@ @;SPMlt;@ @ii-@ @ii@ @=@ii @@ @@ <#159#>@ <#159#> @8@6@ 3t@@ 3o@@ @;SPMlt;@ @ii-@ @ii@ @=@ii @@ @@ <#161#>@ <#161#> @5 @6@ 3o@ by-4 @@ <#163#>@ <#163#> @ 3t @=<#182#><#182#>114 @<#184#>@ <#184#>117 @<#186#>@ <#186#>120 @<#187#>@ <#187#>121 @ <#1095#>122 )

See below for the possible forms of ||.

3 Labels are placed labels on the upper and lower arrows, more correctly `anti-clockwise' and `clockwise', using |^| and |_|. These are entirely optional with the following token, or grouping, giving the contents of the label. When used with |.̇compositemap| the |^| and |_| specify labels for the first and second arrows, respectively.

( @@#1<#922#>@<#189#>+!C<#189#><#190#>#1<#190#><#922#> )

Normally the label is balanced text, set in TEX's math mode, with || setting the style. The default definition is given by ...

This can be altered using | (see below). Although it is possible to specify multiple labels, only the last usage of each of |^| and |_| is actually set, previous specifications being ignored.

Similarly a label for the central Arrow must be given, after the other labels, by enclosing it within braces |<#193#>...<#193#>|. An empty group |<#194#><#194#>| gives an empty label; this is necessary to avoid misinterpretation of subsequent tokens.