PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/18-11:57:50
G07     30.2           68.5                4.5 +/-    0.70       4.7 +/-    0.70  0.030 / 0.030
G08     64.8           49.7                3.9 +/-    1.10       4.9 +/-    1.10  0.030 / 0.030
G09     180.1          49.4                6.4 +/-    0.54       8.1 +/-    0.54  0.170 / 0.320
G11     129.3          29.1                5.8 +/-    1.91      10.4 +/-    1.91  0.150 / 0.300
G18     112.6          10.8                3.4 +/-    3.34       9.3 +/-    3.34  0.060 / 0.090
G23     158.6          14.7                4.0 +/-    2.37      10.0 +/-    2.37  0.110 / 0.100
G27     40.3           17.0                4.3 +/-    2.17      10.3 +/-    2.17  0.200 / 0.220
G28     255.9          40.8                6.4 +/-    2.36       9.2 +/-    2.36  0.130 / 0.140
G30     322.2          52.7              -11.4 +/-   21.78     -13.9 +/-   21.78  0.050 / 0.050