PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/18-14:12:40
G01     74.4           32.6                5.5 +/-    1.15       9.2 +/-    1.15  0.050 / 0.080
G07     134.7          30.9                8.4 +/-    1.24      14.4 +/-    1.24  0.050 / 0.100
G11     56.2           33.9                6.1 +/-    1.19       9.8 +/-    1.19  0.070 / 0.040
G13     278.3          38.8                8.0 +/-    2.09      11.9 +/-    2.09  0.070 / 0.050
G15     305.8          14.4                5.6 +/-    1.94      14.2 +/-    1.94  0.040 / 0.050
G17     225.2          62.2                8.6 +/-    1.12       9.6 +/-    1.12  0.050 / 0.040
G19     220.5          39.8                9.5 +/-    1.41      13.8 +/-    1.41  0.070 / 0.080
G28     359.8          61.4                7.1 +/-    1.01       8.0 +/-    1.01  0.090 / 0.110
G30     131.3          64.4                7.2 +/-    0.47       7.9 +/-    0.47  0.090 / 0.270