PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-08:42:40
G07     37.3           69.5                4.8 +/-    1.08       5.1 +/-    1.08  0.030 / 0.030
G08     54.0           42.1                3.6 +/-    0.95       5.0 +/-    0.95  0.040 / 0.030
G09     174.7          37.5                5.6 +/-    0.88       8.5 +/-    0.88  0.090 / 0.160
G11     122.7          32.2                4.7 +/-    0.72       7.8 +/-    0.72  0.060 / 0.130
G17     198.7          10.8               -6.6 +/-   10.30     -18.1 +/-   10.30  0.030 / 0.040
G18     107.6          13.8                4.5 +/-    2.84      11.5 +/-    2.84  0.040 / 0.050
G23     161.0          13.9                3.6 +/-    1.78       9.2 +/-    1.78  0.150 / 0.210
G27     38.6           12.8                2.2 +/-    2.03       5.8 +/-    2.03  0.120 / 0.220
G28     266.8          48.9                5.5 +/-    4.39       7.1 +/-    4.39  0.150 / 0.250
G30     324.9          54.5                4.1 +/-    0.61       5.0 +/-    0.61  0.150 / 0.330