PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-17:27:40
G01     124.0          14.2               11.7 +/-    1.76      29.8 +/-    1.76  0.050 / 0.050
G07     63.3           69.0               10.9 +/-    0.34      11.6 +/-    0.34  0.060 / 0.050
G08     48.8           38.5                9.3 +/-    1.22      13.9 +/-    1.22  0.030 / 0.030
G09     177.8          32.0               10.3 +/-    1.62      17.3 +/-    1.62  0.030 / 0.030
G11     115.1          37.2               10.5 +/-    0.48      16.1 +/-    0.48  0.030 / 0.030
G13     320.1          14.6               10.5 +/-    3.42      26.3 +/-    3.42  0.030 / 0.030
G17     201.4          16.1               11.5 +/-    3.07      27.8 +/-    3.07  0.100 / 0.080
G18     100.5          18.4               10.6 +/-    1.79      24.4 +/-    1.79  0.080 / 0.090
G28     282.8          55.0               11.4 +/-    2.26      13.6 +/-    2.26  0.110 / 0.210
G30     339.0          64.3               11.0 +/-    0.65      12.1 +/-    0.65  0.110 / 0.180