PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-16:27:30
G01     39.9           14.4                6.8 +/-    1.79      17.1 +/-    1.79  0.060 / 0.160
G06     172.4          43.6               10.1 +/-    1.05      13.9 +/-    1.05  0.070 / 0.160
G13     235.3          20.3               10.7 +/-    1.11      23.4 +/-    1.11  0.110 / 0.230
G15     271.2          11.0                7.9 +/-    3.67      21.6 +/-    3.67  0.090 / 0.180
G17     6.9            68.3                8.2 +/-    0.66       8.8 +/-    0.66  0.050 / 0.080
G19     278.6          67.9                7.6 +/-    0.73       8.1 +/-    0.73  0.050 / 0.090
G24     315.1          22.5                5.0 +/-    1.33      10.4 +/-    1.33  0.080 / 0.180
G28     74.9           45.6                8.6 +/-    0.42      11.5 +/-    0.42  0.110 / 0.190
G30     155.6          25.8                9.6 +/-    1.02      18.4 +/-    1.02  0.080 / 0.250