PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-19:27:50
G01     65.3           32.1               11.7 +/-    1.59      19.6 +/-    1.59  0.120 / 0.190
G07     140.1          27.1               12.9 +/-    1.22      24.0 +/-    1.22  0.090 / 0.180
G11     51.1           28.0                9.6 +/-    1.39      17.6 +/-    1.39  0.030 / 0.040
G13     268.6          36.6               14.2 +/-    1.37      21.8 +/-    1.37  0.040 / 0.030
G15     298.8          15.7               10.4 +/-    1.45      25.3 +/-    1.45  0.080 / 0.110
G17     241.3          70.0               14.3 +/-    0.83      15.1 +/-    0.83  0.070 / 0.120
G18     45.7           15.9               10.0 +/-    1.19      24.3 +/-    1.19  0.040 / 0.040
G19     228.0          44.8               15.0 +/-    2.27      20.2 +/-    2.27  0.040 / 0.040
G28     28.2           58.0               13.9 +/-    1.08      16.0 +/-    1.08  0.170 / 0.350
G30     140.0          56.4               13.6 +/-    0.46      16.0 +/-    0.46  0.110 / 0.260