PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-21:58:00
G01     56.1           28.9               11.7 +/-    0.88      21.0 +/-    0.88  0.070 / 0.100
G07     144.1          19.0               17.8 +/-    2.28      40.1 +/-    2.28  0.080 / 0.090
G11     47.2           21.9               10.0 +/-    1.04      21.0 +/-    1.04  0.060 / 0.180
G13     258.2          33.6               15.4 +/-    0.98      25.0 +/-    0.98  0.050 / 0.140
G15     289.9          16.4               10.3 +/-    1.91      24.8 +/-    1.91  0.040 / 0.070
G17     262.9          74.2               13.6 +/-    0.38      14.1 +/-    0.38  0.040 / 0.060
G18     40.3           10.7               11.3 +/-    1.46      31.1 +/-    1.46  0.070 / 0.230
G19     237.2          53.5               16.4 +/-    1.07      19.8 +/-    1.07  0.070 / 0.230
G28     42.9           55.1               13.3 +/-    0.51      15.9 +/-    0.51  0.070 / 0.260
G30     145.9          46.4               16.9 +/-    1.06      22.3 +/-    1.06  0.070 / 0.260