PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/21-18:27:30
G02     27.7           59.5                9.7 +/-    0.79      11.0 +/-    0.79  0.030 / 0.030
G05     144.1          60.0               11.9 +/-    0.49      13.5 +/-    0.49  0.030 / 0.030
G06     53.2           15.5                6.9 +/-    1.47      17.1 +/-    1.47  0.040 / 0.050
G12     190.9          67.0                9.4 +/-    0.36      10.1 +/-    0.36  0.040 / 0.070
G19     96.9           14.1                9.8 +/-    2.16      24.8 +/-    2.16  0.020 / 0.040
G25     299.2          52.9                9.4 +/-    1.47      11.5 +/-    1.47  0.030 / 0.030
G29     305.0          25.0                8.3 +/-    1.22      16.2 +/-    1.22  0.130 / 0.220