PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-01:12:40
G01     80.4           33.2                7.2 +/-    0.66      11.7 +/-    0.66  0.040 / 0.040
G07     132.2          38.5                8.5 +/-    0.98      12.7 +/-    0.98  0.030 / 0.040
G11     62.6           37.8                5.2 +/-    0.85       7.9 +/-    0.85  0.050 / 0.050
G13     285.6          37.2                7.8 +/-    0.89      11.9 +/-    0.89  0.040 / 0.050
G15     308.7          13.7                5.1 +/-    1.76      13.0 +/-    1.76  0.050 / 0.100
G17     222.2          59.9                9.6 +/-    0.46      10.9 +/-    0.46  0.050 / 0.090
G19     218.9          35.0               10.7 +/-    1.09      17.0 +/-    1.09  0.070 / 0.110
G28     6.3            60.7                5.3 +/-    0.62       5.9 +/-    0.62  0.060 / 0.120
G30     125.8          64.8                7.6 +/-    0.39       8.3 +/-    0.39  0.040 / 0.070