PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-15:42:50
G02     40.7           49.1               11.9 +/-    0.45      15.2 +/-    0.45  0.030 / 0.040
G05     129.2          67.4               12.8 +/-    0.49      13.7 +/-    0.49  0.020 / 0.040
G06     57.8           12.1               10.2 +/-    1.47      27.2 +/-    1.47  0.030 / 0.050
G12     194.2          59.6               12.9 +/-    2.00      14.7 +/-    2.00  0.030 / 0.050
G20     199.9          33.9               15.2 +/-    1.54      24.6 +/-    1.54  0.050 / 0.050
G25     280.3          58.5               15.5 +/-    0.95      17.8 +/-    0.95  0.040 / 0.050
G29     315.9          39.0               11.5 +/-    1.75      17.0 +/-    1.75  0.100 / 0.160