PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-17:43:10
G07     19.6           67.3               12.4 +/-    1.15      13.3 +/-    1.15  0.030 / 0.040
G08     70.1           50.0               13.0 +/-    0.54      16.4 +/-    0.54  0.040 / 0.030
G09     182.1          57.0               13.9 +/-    0.43      16.2 +/-    0.43  0.050 / 0.070
G11     133.3          24.9               16.9 +/-    2.00      33.1 +/-    2.00  0.040 / 0.070
G23     159.4          24.9               12.4 +/-    1.54      24.3 +/-    1.54  0.080 / 0.110
G27     43.9           22.7                9.9 +/-    2.07      20.4 +/-    2.07  0.050 / 0.140
G28     250.0          37.7               14.9 +/-    2.16      22.5 +/-    2.16  0.110 / 0.110
G30     316.7          48.1               12.9 +/-    0.68      16.7 +/-    0.68  0.170 / 0.130