c_pts:=[[3.305428964, -7.831364561], [-4.779378244, -5.036423287], [2.729731226, -7.188726432], [1.617887255, -14.02884686], [.740632254, -5.288511711], [-4.844954122, -5.337785829], [3.320576277, -8.973536884], [3.381646078, -10.68191400], [-7.147892770, -7.631244200], [-6.060295124, -13.58371874], [3.177263000, -11.42847272], [-7.096083955, -11.84716720], [-5.177110919, -14.34436448], [-0.6275859e-2, -4.756500854], [-2.605873303, -4.547800650], [-7.267595851, -11.49396661], [-0.69616672e-1, -4.659704701], [-5.207099971, -14.43215221], [-5.955194363, -6.197632745], [3.365574115, -11.08424761], [3.147167926, -11.61894685]];