Keeps the Precision           2

                                      Obs              N_PI           N

                                        1      3.1415926536           1
                                        2      6.2831853072           2
                                        3      9.4247779608           3
                                        4     12.5663706144           4
                                        5     15.7079632679           5
                                        6     18.8495559215           6
                                        7     21.9911485751           7
                                        8     25.1327412287           8
                                        9     28.2743338823           9
                                       10     31.4159265359          10