PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-04:42:40
G01     72.1           33.0                2.5 +/-    2.53       4.1 +/-    2.53  0.060 / 0.130
G07     136.6          29.7                4.8 +/-    2.07       8.4 +/-    2.07  0.070 / 0.130
G11     53.2           30.2                5.3 +/-   34.41       9.2 +/-   34.41  0.150 / 0.460
G13     275.4          38.1                3.2 +/-    2.72       4.8 +/-    2.72  0.160 / 0.410
G15     304.7          14.3               -2.3 +/-    9.27      -5.9 +/-    9.27  0.080 / 0.140
G17     231.8          71.1                7.5 +/-   35.79       7.9 +/-   35.79  0.100 / 0.120
G18     47.3           16.4                2.9 +/-   33.89       7.1 +/-   33.89  0.050 / 0.050
G19     222.9          38.9                6.5 +/-   34.99       9.6 +/-   34.99  0.040 / 0.070
G28     13.0           60.3                5.2 +/-   34.56       5.9 +/-   34.56  0.030 / 0.040
G30     134.3          64.5                3.6 +/-    2.16       4.0 +/-    2.16  0.030 / 0.040