PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-23:27:30
G02     231.5          72.6                9.6 +/-    0.47      10.0 +/-    0.47  0.070 / 0.100
G05     172.7          12.7               12.8 +/-    2.26      33.7 +/-    2.26  0.060 / 0.090
G06     42.2           66.0                7.9 +/-    0.64       8.6 +/-    0.64  0.040 / 0.070
G12     320.3          44.4                8.2 +/-    0.41      11.1 +/-    0.41  0.040 / 0.060
G17     67.0           24.6               10.7 +/-    1.19      21.1 +/-    1.19  0.180 / 0.220
G19     52.2           41.2                8.5 +/-    0.74      12.1 +/-    0.74  0.200 / 0.240
G24     249.1          37.1               10.6 +/-    1.24      16.2 +/-    1.24  0.030 / 0.040