PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/21-03:27:50
G01     73.4           33.2                4.2 +/-    1.01       6.9 +/-    1.01  0.030 / 0.050
G07     136.1          33.0                7.8 +/-    1.17      12.9 +/-    1.17  0.040 / 0.050
G11     56.6           33.4                4.9 +/-    1.23       7.9 +/-    1.23  0.050 / 0.030
G13     278.5          37.3                5.0 +/-    0.81       7.6 +/-    0.81  0.040 / 0.030
G15     303.8          15.3                1.4 +/-    1.14       3.4 +/-    1.14  0.080 / 0.080
G17     229.9          66.7                6.9 +/-    0.69       7.4 +/-    0.69  0.070 / 0.100
G19     222.7          40.8                6.8 +/-    2.06       9.7 +/-    2.06  0.090 / 0.220
G28     17.0           59.5                4.4 +/-    1.26       5.0 +/-    1.26  0.090 / 0.210
G30     132.8          60.4                7.3 +/-    0.49       8.3 +/-    0.49  0.050 / 0.070