Table 2.

Summary of visual support for algorithm understanding.

	Supported	Unsupported
Distribution plots [12,13]	Relations between parameters and measures	Analysis of images
Search graph [14,15]	Identification of single suitable output image; relations between single input image and input parameter values	Analysis of multiple images, input parameters, or output measures
Structured parameter space [3,16]	Identification of suitable output images; relations of pairs of input parameters and output images	Analysis of multiple images or output measures
Structured output space [17,18]	Relations between input parameters and output images	Analysis of input images or output measures
Dimensional stacking [19]	Relations between parameters and measures	Analysis of images
Hierarchical clustering [21]	Relations between parameters and measures; relations between input parameters and one output image per combination	Analysis of input images; support for multiple output images
Scatterplot matrices [20]	Relations between parameters and measures	Analysis of images
Parallel coordinates [21]	Relations between parameters and measures; relations between input parameters and one output image per combination	Analysis of input images; support for multiple output images
Parameters & images [5,22-25]	Primarily, relations between input parameters and one output image per combination	Limited support for analysis of output measures; analysis of multiple images