PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-00:27:40
G01     102.4          27.9                7.6 +/-    1.38      13.8 +/-    1.38  0.040 / 0.040
G07     113.3          55.0                8.7 +/-    0.54      10.3 +/-    0.54  0.040 / 0.050
G08     42.0           18.6                6.0 +/-    1.38      13.7 +/-    1.38  0.060 / 0.100
G09     174.7          10.5                9.9 +/-    2.69      27.2 +/-    2.69  0.090 / 0.110
G11     86.3           43.6                8.5 +/-    0.46      11.6 +/-    0.46  0.130 / 0.160
G13     306.4          30.7                7.3 +/-    1.40      12.6 +/-    1.40  0.120 / 0.180
G17     208.5          40.9               10.3 +/-    0.94      14.7 +/-    0.94  0.040 / 0.050
G19     210.4          17.4                8.9 +/-    1.22      21.0 +/-    1.22  0.060 / 0.050
G28     328.6          61.7                6.6 +/-    0.60       7.4 +/-    0.60  0.030 / 0.040
G30     69.7           77.7                7.8 +/-    0.62       8.0 +/-    0.62  0.030 / 0.040