PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-21:12:20
G02     31.3           57.2                9.8 +/-    0.45      11.4 +/-    0.45  0.040 / 0.050
G05     143.5          62.4               13.0 +/-    0.82      14.5 +/-    0.82  0.040 / 0.060
G06     55.2           14.0                7.5 +/-    1.76      19.2 +/-    1.76  0.070 / 0.120
G12     194.9          64.6               10.9 +/-    0.54      12.0 +/-    0.54  0.070 / 0.090
G20     197.9          29.6               15.4 +/-    2.30      27.2 +/-    2.30  0.030 / 0.050
G25     287.6          58.5               11.6 +/-    0.80      13.3 +/-    0.80  0.030 / 0.050
G29     309.5          30.8                9.4 +/-    1.56      16.1 +/-    1.56  0.040 / 0.040