This file is indexed.

/usr/lib/blt2.5/tclIndex is in tk8.6-blt2.5 2.5.3+dfsg-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Tcl autoload index file, version 2.0
# This file is generated by the "auto_mkindex" command
# and sourced to set up indexing information for one or
# more commands.  Typically each line is a command that
# sets an element in the auto_index array, where the
# element name is the name of a command and the value is
# a script that loads the command.

set auto_index(Blt_ActiveLegend) [list source $dir/graph.tcl]
set auto_index(Blt_Crosshairs) [list source $dir/graph.tcl]
set auto_index(Blt_ZoomStack) [list source $dir/graph.tcl]
set auto_index(Blt_PrintKey) [list source $dir/graph.tcl]
set auto_index(Blt_ClosestPoint) [list source $dir/graph.tcl]