PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-20:27:50
G01     101.7          28.2               14.0 +/-    1.84      25.5 +/-    1.84  0.080 / 0.170
G07     114.1          54.7               13.1 +/-    0.25      15.6 +/-    0.25  0.070 / 0.160
G08     42.1           19.4                8.8 +/-    2.08      19.7 +/-    2.08  0.080 / 0.130
G11     83.8           43.2               14.0 +/-    0.38      19.4 +/-    0.38  0.060 / 0.140
G13     305.5          31.4               12.4 +/-    1.08      21.1 +/-    1.08  0.020 / 0.040
G17     209.4          38.6               15.7 +/-    0.95      23.4 +/-    0.95  0.030 / 0.070
G18     75.3           24.9               13.0 +/-    0.85      25.5 +/-    0.85  0.040 / 0.080
G19     210.8          16.9               -3.7 +/-   10.43      -8.7 +/-   10.43  0.060 / 0.080
G28     329.3          61.7               12.0 +/-    1.03      13.4 +/-    1.03  0.050 / 0.060
G30     61.4           79.0               12.9 +/-    0.79      13.1 +/-    0.79  0.040 / 0.060