PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-19:12:50
G01     106.9          25.0               13.2 +/-    1.00      25.8 +/-    1.00  0.040 / 0.040
G07     110.1          52.3               12.8 +/-    0.60      15.7 +/-    0.60  0.030 / 0.040
G08     41.8           20.0                9.0 +/-    0.55      19.8 +/-    0.55  0.030 / 0.050
G09     175.6          15.2               15.0 +/-    1.56      37.1 +/-    1.56  0.030 / 0.060
G11     87.6           43.0               13.4 +/-    0.30      18.6 +/-    0.30  0.040 / 0.060
G13     309.5          29.2               10.9 +/-    0.95      19.4 +/-    0.95  0.040 / 0.070
G17     204.8          38.0               14.6 +/-    2.49      22.0 +/-    2.49  0.080 / 0.180
G18     78.4           23.7               12.0 +/-    0.91      24.2 +/-    0.91  0.080 / 0.190
G28     308.4          59.1               11.8 +/-    0.66      13.5 +/-    0.66  0.080 / 0.190
G30     30.3           78.3               12.0 +/-    0.53      12.3 +/-    0.53  0.090 / 0.150