visualization, user study, evaluation, time series, spatial data, collapsed horizon graphs, compact boxplots, braided graphs CC BY 2.0 AT http://creativecommons.org/licenses/by/2.0/at/ Screenshot from the study prototype explaining one of the four visualization techniques - Collapsed Horizon Graphs (CHG) https://phaidra.ustp.at/o:3576 2019 Image In this user study we compare four different visualization techniques of times series in a spatial context using small multiples. Collapsed Horizon Graphs divide the line plot in non-overlapping horizontal and vertical squares. From a 2D color map each square is assigned a unique color. The squares are then layered in a specific order. This screen shows the construction steps of Collapsed Horizon Graphs. eng Dahnert, Manuel Kehrer, Johannes Aigner, Wolfgang Rind, Alexander image/jpeg