PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/27-13:27:50
G01     78.9           32.6                3.5 +/-    1.25       5.8 +/-    1.25  0.050 / 0.050
G07     132.3          34.6                6.5 +/-    1.04      10.3 +/-    1.04  0.040 / 0.050
G11     59.6           36.4                5.1 +/-    0.95       7.8 +/-    0.95  0.050 / 0.090
G13     283.3          38.8                9.0 +/-    2.92      13.4 +/-    2.92  0.050 / 0.090
G15     309.1          13.1                4.4 +/-    2.49      11.5 +/-    2.49  0.090 / 0.050
G17     220.9          58.1                7.8 +/-    1.66       9.0 +/-    1.66  0.060 / 0.060
G18     54.6           21.1                5.3 +/-    3.05      11.3 +/-    3.05  0.080 / 0.090
G19     218.0          36.3                8.1 +/-    1.21      12.5 +/-    1.21  0.120 / 0.140
G28     351.9          61.6                6.6 +/-    0.97       7.4 +/-    0.97  0.100 / 0.200
G30     125.6          68.5                8.3 +/-    0.78       8.9 +/-    0.78  0.140 / 0.270