PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/19-13:27:50
G01     91.9           31.2                5.9 +/-    1.11      10.1 +/-    1.11  0.060 / 0.120
G07     124.2          44.0                7.8 +/-    1.37      10.7 +/-    1.37  0.060 / 0.120
G11     69.0           38.1                4.4 +/-    0.83       6.6 +/-    0.83  0.020 / 0.040
G13     298.6          34.0                6.5 +/-    1.14      10.5 +/-    1.14  0.030 / 0.040
G17     212.8          54.5                8.4 +/-    0.67      10.1 +/-    0.67  0.040 / 0.060
G19     213.6          27.2                7.1 +/-    1.37      13.3 +/-    1.37  0.050 / 0.050
G28     346.0          61.7                4.6 +/-    0.42       5.1 +/-    0.42  0.040 / 0.060
G30     88.9           78.7                6.1 +/-    0.43       6.2 +/-    0.43  0.030 / 0.050