PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/21-14:12:40
G01     67.6           32.0                5.7 +/-    1.43       9.6 +/-    1.43  0.030 / 0.030
G07     138.0          25.8                7.2 +/-    1.07      13.7 +/-    1.07  0.030 / 0.030
G11     52.1           30.0                5.9 +/-    1.30      10.4 +/-    1.30  0.050 / 0.120
G13     270.9          38.2                7.1 +/-    2.64      10.6 +/-    2.64  0.110 / 0.120
G15     300.8          15.6                4.8 +/-    1.55      11.8 +/-    1.55  0.040 / 0.050
G17     233.5          67.3                8.1 +/-    0.84       8.7 +/-    0.84  0.040 / 0.050
G19     224.7          45.2                8.2 +/-    1.55      11.0 +/-    1.55  0.090 / 0.120
G28     10.7           60.8                6.7 +/-    1.74       7.5 +/-    1.74  0.080 / 0.140
G30     137.5          59.0                7.9 +/-    0.47       9.1 +/-    0.47  0.130 / 0.110