/usr/share/tcltk/tcllib1.18/units/pkgIndex.tcl is in tcllib 1.18-dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # Tcl package index file, version 1.1
if {![package vsatisfies [package provide Tcl] 8.1]} {return}
package ifneeded units 2.1.1 [list source [file join $dir units.tcl]]
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