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The con­ven­tion is to ex­press the mea­sure­ment (e.g. “34C”) as a nu­mer­ic val­ue fol­lowed by a let­ter.  The num­ber rep­re­sents strap length in inch­es, while the let­ter de­scribes lo­cal cur­va­ture of space­time as a Rie­mann ten­sor in four di­men­sions.

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