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01 logf adjusted Analysis Composite Virtual ANALYSIS OF IONOSPHERIC Bureau of Standards C-model ionosondes Clearinghouse composite tracings Composite Virtual Height count the number Curves for N(h cusp DENSITY PROFILE DATA ELECTRON DENSITY PROFILE Equipment Development Group extraordinary-ray F region echo frequency markers heavy logf line height curve once height markers individual curves individual profile intersection points Ionogram Scales Ionogram Tracing IONOSPHERIC VERTICAL SOUNDINGS J. W. Wright left end log f logf value markers fit median count median curve median virtual height Monthly Summary Virtual National Bureau nearest kilometer number of curves number of intersection obtain electron density obtaining average profiles Obtaining Monthly Summary Office of Technical ordinary-ray echo Procedures for Obtaining region echo Scaling foF2 SCALING METHOD scaling table Scientific Abstracts SOUNDINGS FOR ELECTRON space provided Spaces for Day spread echo Summary Virtual Height Technical Services total number U.S. Government VFO cam virtual height curve virtual height data