PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-19:42:50
G01     107.6          25.4               15.5 +/-    2.51      30.0 +/-    2.51  0.080 / 0.160
G07     105.8          59.1               15.0 +/-    1.04      17.2 +/-    1.04  0.050 / 0.190
G08     42.4           23.8               10.8 +/-    1.61      21.7 +/-    1.61  0.110 / 0.160
G09     175.3          14.5               15.5 +/-    2.02      39.0 +/-    2.02  0.120 / 0.160
G11     91.5           43.1               15.4 +/-    1.12      21.3 +/-    1.12  0.030 / 0.040
G13     310.2          28.1               11.6 +/-    1.18      21.2 +/-    1.18  0.030 / 0.040
G17     206.8          33.4               15.8 +/-    1.09      25.9 +/-    1.09  0.080 / 0.120
G18     81.4           24.3               15.0 +/-    1.47      29.9 +/-    1.47  0.090 / 0.120
G28     317.7          61.0               12.3 +/-    0.97      13.9 +/-    0.97  0.030 / 0.030
G30     29.3           78.1               13.7 +/-    1.75      13.9 +/-    1.75  0.030 / 0.030