PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/21-14:27:50
G01     59.9           30.1                6.4 +/-    1.27      11.1 +/-    1.27  0.040 / 0.030
G07     141.3          19.6                7.0 +/-    2.05      15.7 +/-    2.05  0.030 / 0.030
G11     48.3           24.8                5.8 +/-    2.17      11.3 +/-    2.17  0.150 / 0.210
G13     262.1          36.4                8.3 +/-    2.29      12.9 +/-    2.29  0.130 / 0.230
G15     294.4          16.3                6.8 +/-    2.19      16.5 +/-    2.19  0.040 / 0.060
G17     249.0          73.0                8.5 +/-    0.88       8.8 +/-    0.88  0.040 / 0.050
G19     231.2          51.6                9.5 +/-    2.89      11.7 +/-    2.89  0.100 / 0.190
G28     23.6           59.6                7.4 +/-    0.84       8.4 +/-    0.84  0.090 / 0.150
G30     143.2          52.0                8.9 +/-    0.81      10.9 +/-    0.81  0.080 / 0.070