PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-17:43:00
G07     4.5            65.6               10.7 +/-    0.69      11.6 +/-    0.69  0.030 / 0.040
G08     79.8           51.7               11.4 +/-    0.49      14.0 +/-    0.49  0.030 / 0.040
G09     184.5          63.7               12.2 +/-    0.43      13.4 +/-    0.43  0.140 / 0.200
G11     137.7          20.8               11.9 +/-    1.68      25.7 +/-    1.68  0.110 / 0.120
G23     158.4          31.2               11.7 +/-    1.59      20.0 +/-    1.59  0.040 / 0.030
G27     47.8           26.9                9.4 +/-    3.46      17.6 +/-    3.46  0.040 / 0.030
G28     244.2          33.3               11.9 +/-    1.54      19.6 +/-    1.54  0.110 / 0.180
G30     311.3          43.6               11.1 +/-    1.12      15.2 +/-    1.12  0.090 / 0.170