PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-20:27:50
G01     103.7          27.3               15.1 +/-    1.22      28.0 +/-    1.22  0.070 / 0.170
G07     111.5          56.2               14.4 +/-    0.37      16.9 +/-    0.37  0.070 / 0.160
G08     42.1           21.0               10.6 +/-    1.06      22.7 +/-    1.06  0.070 / 0.180
G09     174.6          11.3               18.3 +/-    2.53      49.6 +/-    2.53  0.070 / 0.170
G11     86.5           43.3               14.8 +/-    0.66      20.4 +/-    0.66  0.040 / 0.070
G13     307.2          30.3               12.5 +/-    1.69      21.7 +/-    1.69  0.050 / 0.060
G17     208.6          36.4               14.7 +/-    0.54      22.7 +/-    0.54  0.030 / 0.050
G18     77.3           24.8               14.3 +/-    0.90      28.1 +/-    0.90  0.020 / 0.040
G28     325.4          61.5               13.4 +/-    1.13      15.1 +/-    1.13  0.040 / 0.080
G30     50.9           79.0               13.9 +/-    0.60      14.1 +/-    0.60  0.060 / 0.070