(eplain.info)Commutative diagram parameters

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6.2.3 Commutative diagram parameters
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The following is a list describing the parameters used in the
commutative diagram macros. These dimensions may be changed globally or
locally.

'\harrowlength'
     (Default: 60 pt) The length of right or left arrows.

'\varrowlength'
     (Default: 0.618'\harrowlength') The length of up or down arrows.

'\sarrowlength'
     (Default: 60 pt) The horizontal length of slanted arrows.

'\hmorphposn'
     (Default: 0 pt) The horizontal position of the morphism with
     respect to its default position. There are also the dimensions
     '\hmorphposnup', '\hmorphposndn', '\hmorphposnrt', and
     '\hmorphposnlft' for '^'/'_' or '\lft'/'\rt' constructions.

'\vmorphposn'
     (Default: 0 pt) The vertical position of the morphism with respect
     to its default position. There are also the dimensions
     '\vmorphposnup', '\vmorphposndn', '\vmorphposnrt', and
     '\vmorphposnlft' for '^'/'_' or '\lft'/'\rt' constructions.

'\morphdist'
     (Default: 4 pt) The distance of morphisms from slanted lines or
     arrows.

'\channelwidth'
     (Default: 3 pt) The distance between double lines or arrows.

'\hchannel, \vchannel'
     (Defaults: 0 pt) Overrides '\channelwidth'. The horizontal and
     vertical shifts between double lines or arrows.

'\commdiagbaselines'
     (Default: '\baselineskip=15pt \lineskip=3pt \lineskiplimit=3pt ')
     The parameters used by '\commdiag' for setting interline glue.

'\hgrid'
     (Default: 15 pt) The horizontal spacing of the grid used by
     '\gridcommdiag'.

'\vgrid'
     (Default: 15 pt) The vertical spacing of the grid used by
     '\gridcommdiag'.