PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-13:58:10
G01     65.8           31.9                7.4 +/-    1.67      12.5 +/-    1.67  0.140 / 0.330
G06     181.7          10.2              -19.4 +/-   19.87     -53.8 +/-   19.87  0.110 / 0.410
G07     139.4          24.5                9.5 +/-    0.85      18.8 +/-    0.85  0.040 / 0.080
G11     50.2           25.3                6.6 +/-    1.34      12.8 +/-    1.34  0.050 / 0.080
G13     271.8          36.2                8.0 +/-    1.57      12.5 +/-    1.57  0.030 / 0.040
G15     301.1          15.2                3.4 +/-    1.28       8.5 +/-    1.28  0.050 / 0.050
G17     245.9          75.2                8.5 +/-    0.67       8.8 +/-    0.67  0.030 / 0.040
G19     227.8          47.9                9.7 +/-    0.91      12.6 +/-    0.91  0.030 / 0.040
G28     27.2           58.1                6.6 +/-    0.97       7.6 +/-    0.97  0.080 / 0.190
G30     138.8          59.8                9.3 +/-    0.87      10.5 +/-    0.87  0.090 / 0.150