PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/21-13:58:00
G01     75.9           32.7                4.0 +/-    1.42       6.7 +/-    1.42  0.040 / 0.060
G07     133.9          32.1                7.3 +/-    1.13      12.2 +/-    1.13  0.040 / 0.040
G11     57.3           34.8                5.4 +/-    1.96       8.5 +/-    1.96  0.070 / 0.090
G13     280.0          38.9                6.8 +/-    2.02      10.0 +/-    2.02  0.050 / 0.090
G15     306.9          14.0                4.2 +/-    1.98      10.6 +/-    1.98  0.040 / 0.050
G17     223.7          60.9                7.7 +/-    1.70       8.6 +/-    1.70  0.050 / 0.050
G19     219.6          38.7                7.1 +/-    1.28      10.6 +/-    1.28  0.060 / 0.100
G28     357.2          61.5                6.5 +/-    0.70       7.2 +/-    0.70  0.100 / 0.120
G30     129.6          65.8                7.0 +/-    0.56       7.6 +/-    0.56  0.100 / 0.100