Before revision:  We compare TopoLines to 5 popular line smoothing methods using data from 4 application domains . We evaluate TopoLines in terms of l^2-norm of the residual as the simplification threshold is varied, and we perform a user study to evaluate users' perception of the accuracy of TopoLines .
After revision:  We compare TopoLines to 5 popular line smoothing methods using data from 4 application domains .