¡¡¡¡The Count is seven radio observers' weighted averages.
¡¡¡¡CHR is obtained by subtracting the sporadic meteor from Count.
¡¡¡¡It is equal to CHR of the visual observation.
¡¡¡¡The sporadic meteor is calculated from source-data of six days before
¡¡¡¡ZHR corrects in elevation and obtains CHR.