SOL 1077 - A Question for The Community

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So I'm going thru my backlog of images I need to eyeball and decide to stitch a 'panorama' of a rock imaged by the Right MastCam on SOL 1077. Using 8 images (1077MR0047370010600161E01_DXXX-1077MR0047370080600168E01_DXXX), I zoomed-in really tight to check how smoothly the edges were joined and noticed a row of 5 dots in the sand next to the rock.

The dots turned out to be holes in the sand.

My first thought was that they were made by one of the sensors on Curiosity's robotic arm, but after much digging around I can't find any image that shows such a row of studs/rods on the robotic arm that could cause this all-but perfectly straight holes.

My question then is does anyone know of any intrument on the robotic arm that could leave this mark in the sand?