PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-18:27:40
G01     113.9          20.8               10.4 +/-    0.68      22.4 +/-    0.68  0.030 / 0.060
G07     99.4           57.6               11.1 +/-    0.59      12.9 +/-    0.59  0.040 / 0.050
G08     43.1           26.6                8.6 +/-    1.04      16.3 +/-    1.04  0.080 / 0.190
G09     176.9          22.2               10.2 +/-    2.45      21.2 +/-    2.45  0.080 / 0.170
G11     98.2           42.1               11.2 +/-    0.62      15.7 +/-    0.62  0.040 / 0.060
G13     314.6          24.2                9.4 +/-    0.93      18.7 +/-    0.93  0.030 / 0.060
G17     202.3          30.1               10.7 +/-    1.17      18.8 +/-    1.17  0.070 / 0.090
G18     86.6           22.3                8.9 +/-    1.67      18.5 +/-    1.67  0.070 / 0.100
G28     294.7          56.6                9.5 +/-    0.64      11.2 +/-    0.64  0.090 / 0.220
G30     3.2            74.1               10.5 +/-    0.55      10.8 +/-    0.55  0.080 / 0.280