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3 The frames are -pic ;SPMlt;object;SPMgt;s on the form
#defs19#
to be used in ;SPMlt;pos;SPMgt;itions: Dropping a frame with |*|...||...|<#12#>|;SPMlt;frame;SPMgt;|<#12#>| will frame the~c object modified by the given modifiers; connecting with |**|... ||...|<#13#>|;SPMlt;frame;SPMgt;|<#13#>| will frame the object c|.| p modified by the given modifiers.

Below we distinguish between ordinary frames and `brackets'.