PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-00:13:00
G01     109.3          24.4                6.9 +/-    1.27      13.8 +/-    1.27  0.060 / 0.110
G07     102.8          60.2                9.3 +/-    0.72      10.5 +/-    0.72  0.070 / 0.120
G08     42.6           24.5                6.0 +/-    1.79      11.8 +/-    1.79  0.040 / 0.040
G09     176.0          16.6               12.0 +/-    0.84      28.6 +/-    0.84  0.040 / 0.050
G11     96.1           43.2                8.8 +/-    0.60      12.2 +/-    0.60  0.070 / 0.160
G13     311.9          26.5                7.0 +/-    2.63      13.2 +/-    2.63  0.070 / 0.150
G17     205.5          33.9                9.3 +/-    1.53      15.1 +/-    1.53  0.080 / 0.170
G19     208.5          11.2                3.9 +/-   17.07      10.7 +/-   17.07  0.080 / 0.190
G28     314.6          60.7                8.3 +/-    0.65       9.4 +/-    0.65  0.040 / 0.040
G30     34.7           77.4                8.4 +/-    0.56       8.5 +/-    0.56  0.030 / 0.030