PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-11:57:40
G01     62.9           31.3                3.6 +/-    0.48       6.1 +/-    0.48  0.040 / 0.050
G06     181.6          11.8                1.7 +/-   17.83       4.7 +/-   17.83  0.040 / 0.050
G07     140.8          22.8                4.5 +/-    1.43       9.3 +/-    1.43  0.050 / 0.170
G11     49.1           24.0                1.9 +/-    1.39       3.9 +/-    1.39  0.080 / 0.140
G13     268.4          35.6                8.5 +/-    1.42      13.3 +/-    1.42  0.100 / 0.330
G15     297.6          16.0                5.6 +/-    2.86      13.6 +/-    2.86  0.120 / 0.390
G17     254.8          77.0                5.9 +/-    0.44       6.0 +/-    0.44  0.020 / 0.030
G19     230.4          50.2                8.6 +/-    1.03      10.8 +/-    1.03  0.020 / 0.030
G28     32.0           57.2                3.5 +/-    0.73       4.0 +/-    0.73  0.050 / 0.070
G30     141.2          56.4                4.6 +/-    0.80       5.4 +/-    0.80  0.050 / 0.100