/usr/share/gretl/data/misc/ects_nls.gdt is in gretl-data 1.9.9-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!DOCTYPE gretldata SYSTEM "gretldata.dtd">
<gretldata name="ects_nls" frequency="1" startobs="1" endobs="50" type="cross-section">
<description>
Example data set for nonlinear least squares, from Russell Davidson's
ECTS package.</description>
<variables count="3">
<variable name="y"/>
<variable name="x1"/>
<variable name="x2"/>
</variables>
<observations count="50" labels="false">
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