PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/21-14:42:40
G01     53.1           27.1                5.0 +/-    2.11       9.3 +/-    2.11  0.030 / 0.020
G06     178.0          20.6                0.8 +/-   29.12       1.7 +/-   29.12  0.030 / 0.020
G07     144.0          13.3                7.7 +/-    1.28      19.9 +/-    1.28  0.130 / 0.280
G11     45.7           19.3                5.6 +/-    1.74      12.6 +/-    1.74  0.080 / 0.160
G13     254.0          33.4                8.0 +/-    1.76      13.1 +/-    1.76  0.040 / 0.040
G15     287.8          16.1                7.1 +/-    1.36      17.2 +/-    1.36  0.040 / 0.050
G17     274.4          77.1                8.8 +/-    0.50       9.0 +/-    0.50  0.130 / 0.170
G19     239.6          57.7                8.2 +/-    2.03       9.5 +/-    2.03  0.120 / 0.240
G28     35.9           57.9                8.1 +/-    1.13       9.4 +/-    1.13  0.120 / 0.320
G30     147.3          45.0                8.8 +/-    0.70      11.9 +/-    0.70  0.150 / 0.250