PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-20:58:00
G01     74.2           33.3               13.2 +/-    0.66      21.7 +/-    0.66  0.090 / 0.300
G07     135.7          34.1               15.7 +/-    1.49      25.4 +/-    1.49  0.110 / 0.340
G11     56.8           33.8               10.5 +/-    1.04      17.0 +/-    1.04  0.270 / 0.280
G13     278.5          37.6               14.8 +/-    1.05      22.5 +/-    1.05  0.040 / 0.070
G15     305.1          14.7                9.3 +/-    1.38      23.4 +/-    1.38  0.030 / 0.050
G17     227.9          61.8               16.7 +/-    1.48      18.6 +/-    1.48  0.030 / 0.060
G18     51.8           19.9               10.8 +/-    1.04      23.8 +/-    1.04  0.030 / 0.110
G19     222.2          38.4               17.3 +/-    0.70      25.9 +/-    0.70  0.040 / 0.100
G28     15.1           59.8               12.1 +/-    0.49      13.7 +/-    0.49  0.050 / 0.140
G30     132.2          62.9               14.8 +/-    0.95      16.4 +/-    0.95  0.050 / 0.140