PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-02:13:00
G02     53.0           37.5                6.6 +/-    1.30      10.0 +/-    1.30  0.050 / 0.050
G05     72.5           66.2                7.8 +/-    0.45       8.5 +/-    0.45  0.060 / 0.040
G12     188.4          44.3                9.5 +/-    0.47      13.0 +/-    0.47  0.210 / 0.310
G21     265.3          13.1                4.9 +/-   12.20      12.7 +/-   12.20  0.240 / 0.240
G25     250.2          56.9                8.4 +/-    2.17       9.8 +/-    2.17  0.070 / 0.060
G29     325.9          50.3                7.5 +/-    1.28       9.4 +/-    1.28  0.070 / 0.050