PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-19:58:00
G01     96.2           30.2               12.1 +/-    0.93      21.1 +/-    0.93  0.160 / 0.220
G07     120.2          50.5               12.2 +/-    0.72      15.2 +/-    0.72  0.170 / 0.540
G08     42.1           14.7                7.4 +/-    2.82      18.6 +/-    2.82  0.070 / 0.130
G11     76.6           42.2               10.8 +/-    0.65      15.1 +/-    0.65  0.070 / 0.110
G13     300.5          33.9                8.5 +/-    2.11      13.8 +/-    2.11  0.070 / 0.130
G17     212.0          44.2               13.7 +/-    1.26      18.7 +/-    1.26  0.070 / 0.140
G18     69.7           24.8                9.6 +/-    1.02      18.8 +/-    1.02  0.030 / 0.040
G19     212.6          21.3               13.0 +/-    1.83      27.8 +/-    1.83  0.030 / 0.040
G28     339.4          61.9                9.2 +/-    0.38      10.3 +/-    0.38  0.020 / 0.020
G30     86.5           77.9               10.9 +/-    0.26      11.1 +/-    0.26  0.030 / 0.030