PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/10/25-08:27:50
G01     74.6           33.2                2.0 +/-    1.32       3.3 +/-    1.32  0.060 / 0.090
G07     135.4          32.7                5.0 +/-    1.52       8.3 +/-    1.52  0.190 / 0.270
G11     54.9           31.7                2.1 +/-    1.48       3.5 +/-    1.48  0.040 / 0.030
G13     278.2          38.1                3.4 +/-    1.43       5.1 +/-    1.43  0.040 / 0.030
G15     308.2          12.6                2.7 +/-    2.09       7.2 +/-    2.09  0.050 / 0.080
G17     228.3          68.7                5.3 +/-    0.69       5.6 +/-    0.69  0.040 / 0.100
G18     49.9           18.4                1.7 +/-    4.74       3.9 +/-    4.74  0.060 / 0.090
G19     221.6          35.5                5.7 +/-    1.83       9.0 +/-    1.83  0.060 / 0.090
G28     10.9           60.4                3.2 +/-    2.09       3.6 +/-    2.09  0.130 / 0.190
G30     131.7          66.9                6.3 +/-    1.01       6.7 +/-    1.01  0.170 / 0.270