PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-20:42:50
G01     65.4           31.8               11.2 +/-    0.45      18.9 +/-    0.45  0.030 / 0.060
G07     139.2          21.4               13.4 +/-    1.03      28.5 +/-    1.03  0.050 / 0.050
G11     50.1           27.0                9.3 +/-    1.95      17.4 +/-    1.95  0.070 / 0.120
G13     268.2          37.5               12.0 +/-    1.31      18.2 +/-    1.31  0.060 / 0.160
G15     298.0          16.3                9.7 +/-    2.17      23.4 +/-    2.17  0.040 / 0.060
G17     242.0          73.6               14.1 +/-    0.67      14.6 +/-    0.67  0.040 / 0.060
G18     44.2           14.5                7.7 +/-    1.59      19.3 +/-    1.59  0.050 / 0.090
G19     226.9          46.1               13.2 +/-    1.18      17.5 +/-    1.18  0.050 / 0.080
G28     18.7           59.9               12.6 +/-    0.63      14.3 +/-    0.63  0.120 / 0.310
G30     139.5          56.1               13.0 +/-    0.89      15.3 +/-    0.89  0.090 / 0.260