%0 Journal Article %T Four-Point, 2D, Free-Ranging, IMSPE-Optimal, Twin-Point Designs %A Selden Crary %A Jan Stormann %J Statistics %D 2015 %I arXiv %X We report the discovery of a set of four-point, two-factor, free-ranging, putatively IMSPE-optimal designs with a pair of twin points, in the statistical design of computer experiments, under Gaussian-process, fixed-Gaussian-covariance parameter, and zero-nugget assumptions. We conjecture this is the set of free-ranging, twin-point designs with the smallest number of degrees of freedom. %U http://arxiv.org/abs/1510.01685v1