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<H3><A ID="SECTION00004400000000000000">
4. Fancy curves</A>
</H3>
By specifying || an arbitrary object may be used to
construct the curved arrows. Indeed with a
|.̇twocell| different objects can be used with
the upper and lower curves by specifying
|| and ||.
<P>
These specifications apply to all 2-cells subsequently constructed at
the same level of T<SMALL>E</SMALL>X grouping.
Alternatively using a |~|-option, as in <#496#><EM>Extra Options~2</EM><#496#>,
allows such a specification for a single 2-cell or curved part.
<P>
Objects used to construct curves can be of two types.
Either a single ;SPMlt;object;SPMgt; is set once, with copies placed along the curve.
Alternatively a directional object can be aligned with
the tangent along the curve. In this case use a specification takes the
form:
<P>
|<#497#>|;SPMlt;spacer;SPMgt;|~**|;SPMlt;object;SPMgt;|<#497#>|.
<P>
Here ;SPMlt;spacer;SPMgt; may be any ;SPMlt;object;SPMgt; of non-zero size.
Typically it is empty space, |+|;SPMlt;dimen;SPMgt;|<#498#><#498#>|.
<P>
3
<BR>
<tex2html_image_mark>#exercise499#
<BR>
<P>
2