id	keyword
american_scientific_journal-3200	spectrum
american_scientific_journal-3200	use
american_scientific_journal-3200	channels
american_scientific_journal-3200	white
american_scientific_journal-3200	space
american_scientific_journal-3200	delta
american_scientific_journal-3200	technology
american_scientific_journal-3200	area
american_scientific_journal-3200	total