PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/07-12:58:10
G01     65.2           31.8                7.4 +/-    1.03      12.5 +/-    1.03  0.120 / 0.070
G07     139.8          24.3                6.1 +/-    2.36      12.2 +/-    2.36  0.100 / 0.080
G11     50.0           25.2                6.2 +/-    1.77      12.1 +/-    1.77  0.030 / 0.030
G15     300.0          15.5                2.5 +/-    2.57       6.1 +/-    2.57  0.030 / 0.040
G17     247.7          75.7                7.3 +/-    0.38       7.5 +/-    0.38  0.070 / 0.120
G19     228.4          48.4                9.1 +/-    2.16      11.7 +/-    2.16  0.050 / 0.140
G28     28.4           57.8                7.0 +/-    1.75       8.2 +/-    1.75  0.120 / 0.250
G30     139.4          58.8                6.6 +/-    0.39       7.6 +/-    0.39  0.090 / 0.220