In the November 2012 issue of HPC, a graph posted on p. 35 as part of our Work in Progress feature titled “Structural health monitoring: Angling for the air,” was incorrectly identified. HPC editors mistakenly named Advanced Fiber Materials Technologies Co. Ltd. as its source. The article’s author, however, acquired the graphic from the company profiled in the article — Luna Technologies (Roanoke, Va.) — and informed HPC about its genesis since publication. Apologies to Luna Technologies. HPC regrets the error.