PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-19:12:50
G01     112.3          21.9               11.1 +/-    1.81      23.3 +/-    1.81  0.030 / 0.040
G07     102.0          56.6               12.2 +/-    1.00      14.3 +/-    1.00  0.040 / 0.050
G08     42.6           24.7               10.7 +/-    1.98      21.1 +/-    1.98  0.190 / 0.310
G09     176.6          20.4               12.9 +/-    2.25      28.1 +/-    2.25  0.110 / 0.250
G11     95.5           42.4               11.8 +/-    0.80      16.6 +/-    0.80  0.180 / 0.190
G13     313.5          25.5               10.0 +/-    2.04      19.3 +/-    2.04  0.130 / 0.230
G17     202.8          32.3               13.7 +/-    1.12      22.9 +/-    1.12  0.050 / 0.050
G18     84.4           22.7                9.7 +/-    2.96      20.0 +/-    2.96  0.040 / 0.060
G28     298.2          57.3               11.6 +/-    0.87      13.5 +/-    0.87  0.030 / 0.030
G30     7.4            75.2               12.1 +/-    0.65      12.5 +/-    0.65  0.030 / 0.020