PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/20-09:28:00
G07     9.2            66.9                3.9 +/-    0.88       4.3 +/-    0.88  0.030 / 0.040
G08     77.2           53.4                4.1 +/-    0.91       5.0 +/-    0.91  0.030 / 0.030
G09     180.6          56.3                6.1 +/-    0.55       7.1 +/-    0.55  0.080 / 0.190
G11     135.4          24.5                5.2 +/-    2.01      10.3 +/-    2.01  0.160 / 0.290
G23     158.4          22.8                5.0 +/-    2.43      10.3 +/-    2.43  0.040 / 0.040
G27     43.5           21.9                3.1 +/-    2.59       6.6 +/-    2.59  0.040 / 0.040
G28     248.6          35.4                7.0 +/-    1.74      11.0 +/-    1.74  0.040 / 0.040
G30     314.7          46.2                4.5 +/-    0.95       6.0 +/-    0.95  0.040 / 0.050