PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-19:42:50
G01     75.9           32.9                9.5 +/-    1.57      15.6 +/-    1.57  0.040 / 0.040
G07     134.4          28.9               12.3 +/-    1.62      22.1 +/-    1.62  0.040 / 0.040
G11     56.1           33.3                8.9 +/-    2.01      14.5 +/-    2.01  0.060 / 0.100
G13     279.6          38.6                9.4 +/-    2.06      14.0 +/-    2.06  0.080 / 0.100
G15     305.8          14.6                6.8 +/-    1.77      17.0 +/-    1.77  0.030 / 0.030
G17     224.9          65.3               13.6 +/-    0.90      14.8 +/-    0.90  0.030 / 0.030
G18     51.1           19.1                9.0 +/-    2.36      20.1 +/-    2.36  0.050 / 0.110
G19     220.2          38.0               12.3 +/-    2.27      18.4 +/-    2.27  0.060 / 0.110
G28     1.6            61.3               10.1 +/-    0.69      11.3 +/-    0.69  0.080 / 0.180
G30     130.3          64.3               12.5 +/-    0.84      13.7 +/-    0.84  0.070 / 0.190