PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/07-13:27:50
G01     51.9           26.4                6.8 +/-    1.54      12.9 +/-    1.54  0.030 / 0.040
G06     178.7          22.5               11.6 +/-    2.18      24.1 +/-    2.18  0.040 / 0.040
G07     145.3          12.2                9.5 +/-    1.75      25.3 +/-    1.75  0.040 / 0.050
G11     44.7           14.7                6.5 +/-    1.96      16.2 +/-    1.96  0.040 / 0.050
G15     287.5          15.8                6.6 +/-    1.20      16.2 +/-    1.20  0.080 / 0.170
G17     317.4          79.4                7.5 +/-    0.44       7.6 +/-    0.44  0.160 / 0.190
G19     244.8          60.3                8.9 +/-    0.85      10.1 +/-    0.85  0.130 / 0.200
G28     49.8           53.5                7.5 +/-    0.65       9.1 +/-    0.65  0.130 / 0.200
G30     148.6          45.2                9.2 +/-    0.55      12.3 +/-    0.55  0.020 / 0.020