PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-22:28:10
G02     216.8          61.8               15.7 +/-    1.00      17.5 +/-    1.00  0.070 / 0.090
G06     54.4           72.7               13.3 +/-    0.63      13.9 +/-    0.63  0.080 / 0.110
G12     319.1          37.8               11.3 +/-    1.42      17.1 +/-    1.42  0.050 / 0.100
G17     56.6           34.1                9.9 +/-    0.75      16.0 +/-    0.75  0.040 / 0.070
G19     38.9           49.7               10.1 +/-    1.24      12.8 +/-    1.24  0.040 / 0.050
G24     263.5          41.4               14.7 +/-    2.36      20.9 +/-    2.36  0.050 / 0.050
G28     123.5          12.6               12.7 +/-    2.53      33.3 +/-    2.53  0.100 / 0.350