PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/27-21:12:50
G01     61.8           31.2               14.1 +/-    1.09      24.2 +/-    1.09  0.090 / 0.270
G07     141.6          24.2               16.5 +/-    1.25      32.8 +/-    1.25  0.100 / 0.330
G11     49.7           26.2               12.3 +/-    1.42      23.4 +/-    1.42  0.080 / 0.220
G13     264.8          35.7               16.3 +/-    0.91      25.6 +/-    0.91  0.090 / 0.180
G15     295.4          16.3               10.7 +/-    2.04      25.8 +/-    2.04  0.040 / 0.040
G17     247.3          71.2               16.8 +/-    0.61      17.7 +/-    0.61  0.040 / 0.050
G18     43.7           14.2                9.6 +/-    2.06      24.2 +/-    2.06  0.050 / 0.080
G19     231.0          48.2               18.9 +/-    0.73      24.4 +/-    0.73  0.060 / 0.100
G28     33.8           57.0               13.4 +/-    0.62      15.7 +/-    0.62  0.090 / 0.160
G30     142.3          52.4               16.8 +/-    0.92      20.6 +/-    0.92  0.090 / 0.140