PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-19:58:00
G01     83.6           32.5               13.0 +/-    0.67      21.7 +/-    0.67  0.030 / 0.040
G07     130.2          34.8               13.6 +/-    0.56      21.6 +/-    0.56  0.030 / 0.030
G11     61.7           37.0               11.8 +/-    0.79      18.1 +/-    0.79  0.040 / 0.070
G13     287.8          38.1               12.6 +/-    1.10      18.9 +/-    1.10  0.050 / 0.090
G15     311.0          12.5               11.3 +/-    2.11      29.8 +/-    2.11  0.040 / 0.060
G17     217.7          59.3               14.5 +/-    0.62      16.5 +/-    0.62  0.050 / 0.060
G18     56.7           21.5               10.1 +/-    1.86      21.5 +/-    1.86  0.090 / 0.250
G19     216.4          32.0               14.5 +/-    1.91      24.4 +/-    1.91  0.090 / 0.260
G28     349.3          61.6                9.7 +/-    0.63      10.8 +/-    0.63  0.100 / 0.130
G30     119.9          70.4               13.4 +/-    0.56      14.1 +/-    0.56  0.080 / 0.100