PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-09:58:10
G01     67.5           32.3                5.6 +/-    0.95       9.4 +/-    0.95  0.040 / 0.050
G07     138.9          27.0                5.8 +/-    2.16      10.8 +/-    2.16  0.040 / 0.060
G11     51.6           27.5                2.4 +/-    0.88       4.4 +/-    0.88  0.050 / 0.120
G13     273.1          36.5                7.5 +/-    2.20      11.6 +/-    2.20  0.070 / 0.130
G15     300.6          15.8                3.8 +/-    2.28       9.2 +/-    2.28  0.090 / 0.370
G17     241.5          73.7                8.0 +/-    0.97       8.3 +/-    0.97  0.090 / 0.360
G19     226.7          46.4                8.9 +/-    0.73      11.7 +/-    0.73  0.040 / 0.040
G28     25.4           58.3                6.6 +/-    0.48       7.6 +/-    0.48  0.040 / 0.040
G30     137.7          59.6               10.0 +/-    0.80      11.4 +/-    0.80  0.040 / 0.070