%0 Journal Article %T Systematic error correction of a gap measuring system using a multi-layer artifact %A Zhou, Sen %A Xu, Jian %A Wang, Long %A Tao, Lei %A Ding, Yueqing %J Proceedings of SPIE %V 10821 %P 108211N-108211N-7 %@ 0277-786X %D 2018-10-23 %I SPIE %~ DeepDyve