Fasciculus:Methan Lewis.svg

${\displaystyle {\ce {H-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-H}}}$

In your article, replace the image with:

<chem>H-\overset{\displaystyle H \atop | }{\underset{ | \atop \displaystyle H}{C} }-H</chem>

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