PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-18:42:50
G01     92.6           31.3               12.4 +/-    0.65      21.2 +/-    0.65  0.030 / 0.070
G07     123.5          47.7               13.2 +/-    0.92      17.2 +/-    0.92  0.040 / 0.060
G08     42.3           11.1                8.1 +/-    3.62      22.0 +/-    3.62  0.140 / 0.360
G11     72.0           41.1               12.3 +/-    0.47      17.5 +/-    0.47  0.140 / 0.350
G13     297.0          35.2               13.9 +/-    0.79      21.9 +/-    0.79  0.030 / 0.040
G17     213.7          48.5               16.2 +/-    0.82      20.8 +/-    0.82  0.040 / 0.050
G18     66.2           24.4               10.6 +/-    1.22      21.0 +/-    1.22  0.030 / 0.060
G19     213.9          23.8               17.6 +/-    2.54      35.4 +/-    2.54  0.030 / 0.060
G28     345.6          61.8               10.7 +/-    0.63      12.0 +/-    0.63  0.040 / 0.070
G30     98.2           76.7               13.0 +/-    0.27      13.3 +/-    0.27  0.050 / 0.080