PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-16:42:50
G01     52.3           26.6                8.3 +/-    2.11      15.6 +/-    2.11  0.130 / 0.210
G06     178.1          22.9               13.7 +/-    2.20      28.1 +/-    2.20  0.080 / 0.290
G07     144.9          11.6               11.5 +/-    1.60      31.0 +/-    1.60  0.050 / 0.050
G11     44.6           14.4                8.0 +/-    2.61      20.1 +/-    2.61  0.050 / 0.050
G13     255.5          31.7               11.2 +/-    1.40      18.9 +/-    1.40  0.140 / 0.160
G15     290.1          15.3                8.7 +/-    1.51      21.5 +/-    1.51  0.170 / 0.240
G17     314.2          79.6               12.6 +/-    0.47      12.8 +/-    0.47  0.060 / 0.130
G19     243.9          60.0               12.6 +/-    1.34      14.4 +/-    1.34  0.080 / 0.150
G28     48.5           53.8               11.7 +/-    0.68      14.1 +/-    0.68  0.020 / 0.020
G30     148.4          46.7               12.0 +/-    0.85      15.8 +/-    0.85  0.030 / 0.020