PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-21:42:40
G01     65.3           32.1               13.7 +/-    1.36      23.0 +/-    1.36  0.030 / 0.030
G07     140.1          27.1               18.1 +/-    1.03      33.6 +/-    1.03  0.030 / 0.030
G11     51.6           28.7               11.7 +/-    1.55      21.1 +/-    1.55  0.040 / 0.060
G13     268.8          36.6               15.4 +/-    1.82      23.8 +/-    1.82  0.040 / 0.080
G15     298.2          16.1               12.7 +/-    1.44      30.7 +/-    1.44  0.120 / 0.350
G17     239.8          68.0               13.2 +/-    0.52      14.1 +/-    0.52  0.140 / 0.340
G18     45.9           16.1               10.5 +/-    2.06      25.4 +/-    2.06  0.050 / 0.030
G19     228.1          45.6               17.3 +/-    2.09      23.1 +/-    2.09  0.040 / 0.040
G28     28.6           57.9               15.6 +/-    0.87      18.1 +/-    0.87  0.060 / 0.120
G30     139.8          55.2               15.4 +/-    0.41      18.3 +/-    0.41  0.050 / 0.110