PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/21-10:27:50
G01     52.0           26.5                4.8 +/-    1.00       9.1 +/-    1.00  0.040 / 0.070
G06     179.9          21.2                6.4 +/-    1.02      13.6 +/-    1.02  0.040 / 0.060
G07     145.4          13.1                4.9 +/-    3.66      12.8 +/-    3.66  0.100 / 0.230
G11     45.0           15.7                1.3 +/-    1.36       3.3 +/-    1.36  0.090 / 0.260
G13     254.9          31.4                7.6 +/-    1.87      12.9 +/-    1.87  0.200 / 0.340
G15     286.2          16.1                5.0 +/-    2.64      12.1 +/-    2.64  0.110 / 0.490
G17     314.4          79.4                5.1 +/-    0.83       5.2 +/-    0.83  0.090 / 0.120
G19     244.6          60.0                8.0 +/-    1.06       9.1 +/-    1.06  0.070 / 0.120
G28     50.0           53.4                3.5 +/-    0.57       4.3 +/-    0.57  0.030 / 0.030
G30     148.4          44.1                8.0 +/-    0.95      10.9 +/-    0.95  0.030 / 0.030