PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/05/12-18:42:40
G01     77.3           32.9               11.2 +/-    1.06      18.5 +/-    1.06  0.040 / 0.060
G07     133.6          30.3               13.4 +/-    1.11      23.4 +/-    1.11  0.040 / 0.060
G11     57.2           34.3               10.2 +/-    0.65      16.4 +/-    0.65  0.080 / 0.230
G13     281.2          38.7               11.5 +/-    1.19      17.1 +/-    1.19  0.090 / 0.200
G15     306.9          14.2                8.3 +/-    1.69      20.9 +/-    1.69  0.070 / 0.090
G17     223.2          63.5               14.1 +/-    0.64      15.6 +/-    0.64  0.070 / 0.090
G18     52.4           19.8               10.0 +/-    0.99      22.1 +/-    0.99  0.070 / 0.140
G19     219.3          37.1               13.9 +/-    1.19      21.2 +/-    1.19  0.070 / 0.130
G28     358.6          61.4               11.5 +/-    0.78      12.9 +/-    0.78  0.080 / 0.120
G30     128.7          64.9               12.5 +/-    0.73      13.6 +/-    0.73  0.070 / 0.120