PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-19:42:40
G01     91.9           30.9               13.8 +/-    0.85      23.7 +/-    0.85  0.030 / 0.040
G07     124.7          40.9               13.1 +/-    0.89      18.7 +/-    0.89  0.030 / 0.040
G11     69.3           40.3               12.3 +/-    0.54      17.8 +/-    0.54  0.040 / 0.070
G13     296.2          36.2               13.6 +/-    1.16      21.2 +/-    1.16  0.030 / 0.070
G17     212.0          52.3               15.3 +/-    0.46      18.8 +/-    0.46  0.050 / 0.060
G18     63.6           23.2               11.1 +/-    1.05      22.6 +/-    1.05  0.050 / 0.060
G19     213.1          25.6               17.8 +/-    2.44      34.3 +/-    2.44  0.070 / 0.160
G28     335.4          61.5               10.9 +/-    0.65      12.2 +/-    0.65  0.080 / 0.170
G30     101.1          75.9               13.2 +/-    0.83      13.6 +/-    0.83  0.090 / 0.120