PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/31-14:28:10
G01     43.6           19.7                5.1 +/-    2.82      11.3 +/-    2.82  0.040 / 0.060
G06     175.2          33.0                8.0 +/-    1.26      13.2 +/-    1.26  0.040 / 0.060
G13     241.5          26.4                9.1 +/-    2.06      17.2 +/-    2.06  0.030 / 0.020
G15     276.4          13.9                6.5 +/-    1.84      16.6 +/-    1.84  0.030 / 0.030
G17     331.2          76.1                6.3 +/-    0.59       6.5 +/-    0.59  0.040 / 0.050
G19     262.7          67.2                6.6 +/-    0.67       7.1 +/-    0.67  0.040 / 0.040
G28     55.9           53.9                7.6 +/-    0.69       9.1 +/-    0.69  0.080 / 0.110
G30     152.7          33.0                6.9 +/-    0.88      11.4 +/-    0.88  0.070 / 0.120