%ch x0 sigma 0 0.33267 0.74529 1 -0.37423 0.73505 2 -1.0116 0.82071 3 -0.92258 0.82659 4 -0.28638 0.77795 5 -1.0259 0.83557 6 -0.14812 0.73987 7 1.3092 0.72436 8 1.9115 0.68467 9 1.5007 0.67798 16 0.28854 0.7749 17 0.52277 0.80861 18 -0.30276 0.80687 19 -0.06665 0.7343 20 0.95975 0.82874 21 -1.1563 0.67681 22 -0.56796 0.86337 23 -2.1596 0.74012 24 -0.5255 0.75234 25 -0.9873 0.66115 26 0.88301 0.67813 27 -2.8743 0.75778 28 -0.43868 0.67101 29 -0.91505 0.69442 30 0.17195 0.67858 31 1.6826 0.68564