PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/06/20-15:27:50
G01     96.5           29.3                9.4 +/-    0.60      16.8 +/-    0.60  0.040 / 0.060
G07     120.3          46.1               11.5 +/-    0.62      15.3 +/-    0.62  0.030 / 0.060
G08     41.8           14.0                6.5 +/-    0.86      16.6 +/-    0.86  0.060 / 0.070
G11     75.5           42.3                9.1 +/-    1.06      12.8 +/-    1.06  0.060 / 0.060
G13     300.7          34.7                9.9 +/-    1.16      15.8 +/-    1.16  0.040 / 0.070
G17     209.8          45.4               12.6 +/-    0.76      16.9 +/-    0.76  0.040 / 0.090
G18     69.0           24.3                8.6 +/-    0.73      17.1 +/-    0.73  0.070 / 0.120
G19     211.1          22.3               11.2 +/-    1.18      23.3 +/-    1.18  0.070 / 0.120
G28     324.5          60.7                9.7 +/-    1.06      10.9 +/-    1.06  0.040 / 0.080
G30     86.7           77.5               10.4 +/-    0.76      10.7 +/-    0.76  0.040 / 0.080