PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-01:58:00
G01     56.7           29.2                4.9 +/-    1.63       8.7 +/-    1.63  0.050 / 0.040
G06     180.7          16.7                6.8 +/-    1.30      16.2 +/-    1.30  0.040 / 0.040
G07     143.8          19.4                5.3 +/-    0.94      11.8 +/-    0.94  0.160 / 0.290
G11     48.0           23.4                3.5 +/-    1.20       7.2 +/-    1.20  0.140 / 0.320
G13     259.4          33.8                7.2 +/-    1.11      11.6 +/-    1.11  0.030 / 0.020
G15     289.9          16.7                6.5 +/-    1.81      15.4 +/-    1.81  0.020 / 0.020
G17     269.3          76.7                5.8 +/-    0.73       5.9 +/-    0.73  0.070 / 0.100
G19     236.9          54.2                7.0 +/-    2.18       8.5 +/-    2.18  0.050 / 0.090
G28     42.3           55.2                3.5 +/-    2.18       4.1 +/-    2.18  0.050 / 0.140
G30     144.9          44.5                7.9 +/-    0.64      10.7 +/-    0.64  0.100 / 0.140