PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/06/21-16:27:50
G01     61.5           30.6                9.8 +/-    0.82      17.0 +/-    0.82  0.040 / 0.050
G07     140.7          19.7               11.5 +/-    1.15      25.5 +/-    1.15  0.040 / 0.060
G11     48.7           25.3                9.7 +/-    1.92      18.8 +/-    1.92  0.120 / 0.170
G13     263.8          36.7               12.4 +/-    1.90      19.1 +/-    1.90  0.120 / 0.150
G15     295.1          16.4                9.0 +/-    2.79      21.6 +/-    2.79  0.150 / 0.240
G17     247.5          73.6               12.3 +/-    0.29      12.8 +/-    0.29  0.120 / 0.260
G18     42.6           13.3                7.2 +/-    3.45      18.6 +/-    3.45  0.060 / 0.070
G19     229.9          50.0               12.7 +/-    2.22      16.0 +/-    2.22  0.060 / 0.070
G28     22.3           59.7               10.9 +/-    1.13      12.4 +/-    1.13  0.030 / 0.040
G30     141.9          51.6               11.7 +/-    0.64      14.4 +/-    0.64  0.020 / 0.040