PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/07-20:27:50
G01     63.9           31.7               10.3 +/-    0.37      17.4 +/-    0.37  0.110 / 0.310
G07     140.7          25.9               14.8 +/-    0.81      28.3 +/-    0.81  0.110 / 0.380
G11     50.6           27.4                8.3 +/-    1.52      15.4 +/-    1.52  0.060 / 0.120
G13     267.1          36.3               13.9 +/-    1.72      21.6 +/-    1.72  0.060 / 0.120
G15     297.4          16.1               11.7 +/-    2.79      28.3 +/-    2.79  0.060 / 0.080
G17     243.4          70.3               14.3 +/-    0.52      15.1 +/-    0.52  0.060 / 0.090
G18     44.9           15.3                7.4 +/-    1.78      18.3 +/-    1.78  0.040 / 0.050
G19     229.2          46.3               16.4 +/-    0.97      21.7 +/-    0.97  0.040 / 0.060
G28     30.5           57.6               10.5 +/-    0.96      12.2 +/-    0.96  0.090 / 0.190
G30     140.9          54.6               12.2 +/-    0.96      14.5 +/-    0.96  0.090 / 0.180