INTRODUCTION: Obtaining and using filters; adding filters to the collection; about the lists
FILTER LISTS by WAVELENGTH:
	blueward of 4000 4000 to 4499 4500 to 4999 5000 to 5499 5500 to 5999 6000 to 6499 6500 to 6999 7000 to 7499 7500 to 7999 8000 and redward
BROADBAND FILTERS KEPT at 3-METER
FILTERS KEPT at 1-METER
TRANSMISSION TABLES for U, B, V, R, Rs, and I
TRACES:
	U B V R Rs I (individual plots) B, V, R, Rs, I (single plot) Mt. Hamilton and Mauna Kea sky spectra and B, V, R, and I transmission