PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-02:58:00
G02     56.0           35.0                4.7 +/-    0.66       7.5 +/-    0.66  0.040 / 0.060
G05     64.8           63.8                7.7 +/-    0.68       8.5 +/-    0.68  0.040 / 0.070
G12     187.5          40.3                9.1 +/-    1.69      13.2 +/-    1.69  0.160 / 0.430
G13     131.0          11.7                5.8 +/-   14.09      15.7 +/-   14.09  0.220 / 0.430
G21     268.2          15.6                8.8 +/-    2.72      21.5 +/-    2.72  0.070 / 0.080
G25     243.1          55.1                9.0 +/-    0.70      10.7 +/-    0.70  0.060 / 0.090
G29     329.0          54.0                7.4 +/-    0.49       8.9 +/-    0.49  0.050 / 0.050