PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-04:27:40
G01     110.4          23.7                5.9 +/-    2.06      11.9 +/-    2.06  0.040 / 0.050
G07     101.2          60.3                5.3 +/-    0.34       6.0 +/-    0.34  0.040 / 0.050
G08     42.4           23.2                2.0 +/-    1.04       4.1 +/-    1.04  0.030 / 0.040
G09     175.9          17.4                5.0 +/-    1.14      11.7 +/-    1.14  0.030 / 0.040
G11     94.9           42.1                5.0 +/-    0.55       7.1 +/-    0.55  0.060 / 0.140
G13     313.0          25.2                3.5 +/-    2.14       6.7 +/-    2.14  0.060 / 0.120
G17     204.4          35.1                6.2 +/-    1.05       9.8 +/-    1.05  0.040 / 0.060
G19     208.1          10.9               -0.4 +/-   12.45      -1.2 +/-   12.45  0.050 / 0.060
G28     312.4          60.5                3.4 +/-    0.69       3.8 +/-    0.69  0.070 / 0.190
G30     18.2           76.4                4.3 +/-    0.69       4.4 +/-    0.69  0.070 / 0.200