PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/05/01-21:12:50
G02     199.5          16.0               21.5 +/-    1.17      52.2 +/-    1.17  0.080 / 0.160
G06     174.6          46.0               15.0 +/-    1.28      20.0 +/-    1.28  0.090 / 0.160
G13     230.1          16.8               18.2 +/-    3.37      43.3 +/-    3.37  0.060 / 0.070
G17     16.0           63.7               10.4 +/-    0.61      11.5 +/-    0.61  0.050 / 0.080
G19     305.2          71.7               11.3 +/-    0.60      11.9 +/-    0.60  0.060 / 0.070
G24     312.5          26.5               10.4 +/-    2.86      19.7 +/-    2.86  0.060 / 0.070
G28     78.0           46.2               10.3 +/-    0.56      13.7 +/-    0.56  0.040 / 0.040
G30     155.8          17.7               17.6 +/-    1.02      40.9 +/-    1.02  0.040 / 0.040