PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-21:13:10
G01     39.2           13.6                7.9 +/-    1.00      20.3 +/-    1.00  0.090 / 0.170
G02     199.2          11.2                5.4 +/-   21.61      14.8 +/-   21.61  0.100 / 0.160
G06     175.8          40.3               14.0 +/-    1.17      20.2 +/-    1.17  0.080 / 0.160
G13     234.1          20.3               13.3 +/-    1.64      29.0 +/-    1.64  0.080 / 0.160
G15     267.2          11.1               11.3 +/-    2.56      30.6 +/-    2.56  0.040 / 0.070
G17     8.7            67.8               11.3 +/-    0.70      12.1 +/-    0.70  0.040 / 0.070
G19     287.3          70.7               11.7 +/-    0.55      12.3 +/-    0.55  0.270 / 0.450
G24     314.9          22.6                7.6 +/-    2.02      15.8 +/-    2.02  0.270 / 0.410
G28     71.2           48.7               10.5 +/-    0.70      13.4 +/-    0.70  0.070 / 0.250
G30     154.8          22.7               14.1 +/-    0.95      29.0 +/-    0.95  0.080 / 0.220