(spectral lines specific to water)
Water lines (spectral lines) are sometimes from water masers,
from absorption by gaseous or liquid water.
Water produces many lines affecting significant
bands of the spectrum,
which is not unusual for compounds.
Water absorption lines are of interest when found in
extra-solar planet atmospheres. Water's presence in Earth's
atmosphere significantly limits microwave observations
from the ground, motivating observations from space
as well as from high, dry ground locations.
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