PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-20:12:50
G01     77.5           32.9               12.7 +/-    1.80      21.0 +/-    1.80  0.070 / 0.090
G07     133.6          30.4               15.0 +/-    2.00      26.1 +/-    2.00  0.060 / 0.100
G11     57.1           34.0               12.4 +/-    2.50      20.0 +/-    2.50  0.040 / 0.050
G13     281.3          38.6               11.3 +/-    1.27      16.8 +/-    1.27  0.040 / 0.040
G15     306.9          14.2                9.6 +/-    3.02      24.4 +/-    3.02  0.030 / 0.030
G17     223.2          64.3               15.9 +/-    1.10      17.5 +/-    1.10  0.030 / 0.030
G18     52.1           19.6               11.7 +/-    2.29      26.1 +/-    2.29  0.080 / 0.100
G19     219.4          36.7               16.5 +/-    2.08      25.4 +/-    2.08  0.080 / 0.110
G28     359.4          61.4               13.3 +/-    1.20      15.0 +/-    1.20  0.110 / 0.150
G30     128.5          65.9               15.6 +/-    0.69      16.9 +/-    0.69  0.100 / 0.110