PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-07:28:00
G08     297.4          21.6                5.8 +/-    2.85      12.3 +/-    2.85  0.110 / 0.100
G10     3.5            62.9                3.3 +/-    0.93       3.7 +/-    0.93  0.060 / 0.140
G14     228.2          40.2                8.5 +/-    1.28      12.3 +/-    1.28  0.060 / 0.100
G20     78.3           37.6                5.5 +/-    2.67       8.3 +/-    2.67  0.090 / 0.110
G21     145.7          42.4                7.1 +/-    1.08      10.0 +/-    1.08  0.040 / 0.080
G24     57.3           26.1                5.5 +/-    1.75      10.5 +/-    1.75  0.040 / 0.070
G27     255.7          32.4                7.3 +/-    2.00      12.2 +/-    2.00  0.120 / 0.200
G32     244.4          68.3                6.2 +/-    0.66       6.6 +/-    0.66  0.100 / 0.210