PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/15-22:28:10
G02     208.9          50.5               16.9 +/-    0.70      21.2 +/-    0.70  0.210 / 0.140
G06     100.7          79.2               15.1 +/-    0.36      15.3 +/-    0.36  0.090 / 0.110
G12     315.0          27.7               12.2 +/-    1.56      22.4 +/-    1.56  0.090 / 0.070
G17     46.6           41.6               11.6 +/-    1.40      16.5 +/-    1.40  0.060 / 0.050
G19     24.3           56.8               13.3 +/-    0.80      15.6 +/-    0.80  0.040 / 0.040
G24     279.2          42.4               13.3 +/-    1.22      18.6 +/-    1.22  0.020 / 0.020
G28     115.5          20.8               14.3 +/-    1.47      30.9 +/-    1.47  0.270 / 0.200