PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-12:58:00
G03     233.4          67.7                5.4 +/-    0.56       5.8 +/-    0.56  0.130 / 0.300
G09     303.8          18.6                5.6 +/-    0.77      12.7 +/-    0.77  0.110 / 0.270
G14     98.7           18.1                6.5 +/-    0.96      15.1 +/-    0.96  0.050 / 0.060
G16     121.7          59.8                9.3 +/-    0.89      10.6 +/-    0.89  0.050 / 0.070
G22     189.6          52.0                8.3 +/-    0.95      10.3 +/-    0.95  0.040 / 0.060
G23     323.4          53.3                7.2 +/-    0.95       8.8 +/-    0.95  0.040 / 0.050
G26     65.9           49.8                5.6 +/-    0.62       7.0 +/-    0.62  0.030 / 0.050
G31     53.2           17.1                4.2 +/-    0.94      10.0 +/-    0.94  0.030 / 0.050