PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/15-20:42:50
G01     104.4          27.0               12.6 +/-    1.60      23.5 +/-    1.60  0.100 / 0.270
G07     110.6          56.7               13.4 +/-    0.36      15.6 +/-    0.36  0.220 / 0.230
G08     42.2           21.8                9.2 +/-    2.76      19.5 +/-    2.76  0.070 / 0.050
G09     174.8          11.9               19.7 +/-    1.96      52.8 +/-    1.96  0.060 / 0.040
G11     87.5           43.4               15.4 +/-    1.20      21.3 +/-    1.20  0.040 / 0.010
G13     307.7          29.9               11.9 +/-    0.82      20.9 +/-    0.82  0.040 / 0.010
G17     208.3          36.0               15.9 +/-    1.59      24.7 +/-    1.59  0.070 / 0.140
G18     78.0           24.7               11.9 +/-    1.13      23.4 +/-    1.13  0.060 / 0.130
G28     324.2          61.5               11.7 +/-    0.83      13.1 +/-    0.83  0.030 / 0.010
G30     48.2           78.9               12.8 +/-    1.15      13.0 +/-    1.15  0.030 / 0.010