PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/29-17:57:50
G01     123.9          13.5               11.9 +/-    2.30      30.7 +/-    2.30  0.030 / 0.040
G07     76.6           64.4               10.8 +/-    0.37      11.8 +/-    0.37  0.030 / 0.040
G08     48.0           36.5                8.2 +/-    0.76      12.7 +/-    0.76  0.050 / 0.080
G09     178.5          34.0               11.5 +/-    1.68      18.6 +/-    1.68  0.080 / 0.080
G11     113.2          37.8               12.5 +/-    0.96      18.8 +/-    0.96  0.050 / 0.090
G13     319.8          15.1                7.5 +/-    2.29      18.5 +/-    2.29  0.050 / 0.090
G17     199.8          18.3               13.0 +/-    0.78      29.8 +/-    0.78  0.130 / 0.310
G18     98.5           18.1               11.9 +/-    2.22      27.4 +/-    2.22  0.140 / 0.370
G28     275.9          51.1               11.3 +/-    1.28      14.1 +/-    1.28  0.090 / 0.290
G30     340.0          65.0                9.4 +/-    0.64      10.3 +/-    0.64  0.090 / 0.250