PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/20-18:12:30
G02     265.3          79.1                8.3 +/-    0.81       8.4 +/-    0.81  0.040 / 0.040
G05     169.2          21.8                9.9 +/-    3.42      20.9 +/-    3.42  0.040 / 0.050
G06     39.6           51.5               11.6 +/-    0.72      14.3 +/-    0.72  0.080 / 0.170
G12     320.5          57.2                7.5 +/-    0.27       8.7 +/-    0.27  0.080 / 0.150
G17     74.4           20.9                7.9 +/-    1.52      17.1 +/-    1.52  0.270 / 0.300
G19     64.0           33.2                7.1 +/-    1.16      11.7 +/-    1.16  0.200 / 0.350
G24     239.2          30.7                9.4 +/-    1.85      16.2 +/-    1.85  0.070 / 0.090
G25     317.2          17.0                7.3 +/-    2.52      17.2 +/-    2.52  0.070 / 0.080