What is "gapchart"

In information visualization and computing, GapChart is a chart for displaying time series data by using non overlapped thick curves. It was invented in 2013 by Fred. Vernier (LIMSI labs at Univ. Paris Sud) and Charles Perin (LIMSI labs at Univ. Paris Sud and AVIZ-INRIA). Jeremy Boy (AVIZ-INRIA) helped them to improve the original design to its current form.