PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-20:27:50
G01     73.6           32.9               11.9 +/-    0.62      19.7 +/-    0.62  0.030 / 0.040
G07     135.5          27.6               13.1 +/-    1.13      24.2 +/-    1.13  0.040 / 0.040
G11     54.6           32.0                9.4 +/-    0.71      15.8 +/-    0.71  0.070 / 0.140
G13     277.2          38.5               11.7 +/-    0.91      17.4 +/-    0.91  0.060 / 0.140
G15     304.2          15.0                8.8 +/-    2.69      21.8 +/-    2.69  0.050 / 0.060
G17     227.7          67.4               13.8 +/-    1.07      14.8 +/-    1.07  0.050 / 0.050
G18     49.4           18.1                8.7 +/-    0.97      20.0 +/-    0.97  0.050 / 0.070
G19     221.4          39.7               15.6 +/-    1.03      22.8 +/-    1.03  0.050 / 0.090
G28     5.6            61.0               10.5 +/-    0.62      11.9 +/-    0.62  0.070 / 0.190
G30     132.6          62.9               13.0 +/-    0.66      14.4 +/-    0.66  0.070 / 0.210