PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/23-13:58:00
G01     71.3           32.4                6.5 +/-    1.36      10.9 +/-    1.36  0.070 / 0.130
G07     136.3          28.8                7.0 +/-    0.96      12.5 +/-    0.96  0.070 / 0.100
G11     54.3           32.3                5.4 +/-    1.28       9.1 +/-    1.28  0.040 / 0.040
G13     275.0          38.7                6.8 +/-    1.14      10.1 +/-    1.14  0.050 / 0.050
G15     303.6          14.9                3.8 +/-    1.28       9.4 +/-    1.28  0.040 / 0.070
G17     228.5          64.4                8.1 +/-    1.06       8.9 +/-    1.06  0.050 / 0.060
G19     222.3          42.2                8.3 +/-    1.65      11.6 +/-    1.65  0.090 / 0.100
G28     4.5            61.2                6.8 +/-    0.68       7.6 +/-    0.68  0.130 / 0.110
G30     134.3          62.2                6.9 +/-    0.64       7.7 +/-    0.64  0.090 / 0.230