PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-20:28:10
G01     68.5           32.4               14.2 +/-    0.69      23.8 +/-    0.69  0.040 / 0.050
G07     137.8          23.7               15.7 +/-    0.74      31.6 +/-    0.74  0.050 / 0.060
G11     51.7           29.0               12.2 +/-    0.90      21.8 +/-    0.90  0.090 / 0.180
G13     271.6          38.1               15.5 +/-    0.59      23.2 +/-    0.59  0.090 / 0.170
G15     300.4          15.9                9.9 +/-    2.34      24.1 +/-    2.34  0.040 / 0.040
G17     235.5          71.2               15.8 +/-    1.16      16.5 +/-    1.16  0.030 / 0.050
G18     46.1           16.0               11.2 +/-    1.89      27.2 +/-    1.89  0.050 / 0.070
G19     224.6          43.7               17.4 +/-    0.92      24.0 +/-    0.92  0.060 / 0.090
G28     13.6           60.4               13.5 +/-    0.57      15.3 +/-    0.57  0.130 / 0.350
G30     137.1          58.7               15.9 +/-    0.74      18.3 +/-    0.74  0.130 / 0.450