/usr/share/gretl/data/misc/gear.gdt is in gretl-data 2016d-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 version="1.3" name="gear" frequency="1" startobs="1" endobs="100" type="cross-section">
<description>Sample data from NIST
http://www.itl.nist.gov/div898/handbook/eda/section3/eda3581.htm
Used in the illustrations for the Bartlett and Levene tests for
homogeneity of variance across groups.
</description>
<variables count="2">
<variable name="y"
label="gear diameter"
/>
<variable name="x"
label="batch number"
discrete="true"
/>
</variables>
<observations count="100" labels="false">
<obs>1.006 1 </obs>
<obs>0.996 1 </obs>
<obs>0.998 1 </obs>
<obs>1 1 </obs>
<obs>0.992 1 </obs>
<obs>0.993 1 </obs>
<obs>1.002 1 </obs>
<obs>0.999 1 </obs>
<obs>0.994 1 </obs>
<obs>1 1 </obs>
<obs>0.998 2 </obs>
<obs>1.006 2 </obs>
<obs>1 2 </obs>
<obs>1.002 2 </obs>
<obs>0.997 2 </obs>
<obs>0.998 2 </obs>
<obs>0.996 2 </obs>
<obs>1 2 </obs>
<obs>1.006 2 </obs>
<obs>0.988 2 </obs>
<obs>0.991 3 </obs>
<obs>0.987 3 </obs>
<obs>0.997 3 </obs>
<obs>0.999 3 </obs>
<obs>0.995 3 </obs>
<obs>0.994 3 </obs>
<obs>1 3 </obs>
<obs>0.999 3 </obs>
<obs>0.996 3 </obs>
<obs>0.996 3 </obs>
<obs>1.005 4 </obs>
<obs>1.002 4 </obs>
<obs>0.994 4 </obs>
<obs>1 4 </obs>
<obs>0.995 4 </obs>
<obs>0.994 4 </obs>
<obs>0.998 4 </obs>
<obs>0.996 4 </obs>
<obs>1.002 4 </obs>
<obs>0.996 4 </obs>
<obs>0.998 5 </obs>
<obs>0.998 5 </obs>
<obs>0.982 5 </obs>
<obs>0.99 5 </obs>
<obs>1.002 5 </obs>
<obs>0.984 5 </obs>
<obs>0.996 5 </obs>
<obs>0.993 5 </obs>
<obs>0.98 5 </obs>
<obs>0.996 5 </obs>
<obs>1.009 6 </obs>
<obs>1.013 6 </obs>
<obs>1.009 6 </obs>
<obs>0.997 6 </obs>
<obs>0.988 6 </obs>
<obs>1.002 6 </obs>
<obs>0.995 6 </obs>
<obs>0.998 6 </obs>
<obs>0.981 6 </obs>
<obs>0.996 6 </obs>
<obs>0.99 7 </obs>
<obs>1.004 7 </obs>
<obs>0.996 7 </obs>
<obs>1.001 7 </obs>
<obs>0.998 7 </obs>
<obs>1 7 </obs>
<obs>1.018 7 </obs>
<obs>1.01 7 </obs>
<obs>0.996 7 </obs>
<obs>1.002 7 </obs>
<obs>0.998 8 </obs>
<obs>1 8 </obs>
<obs>1.006 8 </obs>
<obs>1 8 </obs>
<obs>1.002 8 </obs>
<obs>0.996 8 </obs>
<obs>0.998 8 </obs>
<obs>0.996 8 </obs>
<obs>1.002 8 </obs>
<obs>1.006 8 </obs>
<obs>1.002 9 </obs>
<obs>0.998 9 </obs>
<obs>0.996 9 </obs>
<obs>0.995 9 </obs>
<obs>0.996 9 </obs>
<obs>1.004 9 </obs>
<obs>1.004 9 </obs>
<obs>0.998 9 </obs>
<obs>0.999 9 </obs>
<obs>0.991 9 </obs>
<obs>0.991 10 </obs>
<obs>0.995 10 </obs>
<obs>0.984 10 </obs>
<obs>0.994 10 </obs>
<obs>0.997 10 </obs>
<obs>0.997 10 </obs>
<obs>0.991 10 </obs>
<obs>0.998 10 </obs>
<obs>1.004 10 </obs>
<obs>0.997 10 </obs>
</observations>
</gretldata>
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