If, on the otherhand, the line is resolved, then the linewidth in microns (given by:

linewidth = [ delta_v (km/s) / 3x10^5 km/s ] x lambda

where delta_v is the linewidth in km/s and lambda) should be entered.

The time estimator and the PH compute the flux from a resolved line in the following manner:

Flux[observed] = Flux[emitted] x 1 / SQRT [ 1 + ( linewidth / res )**2 ]

where res = the LWS resolution element in microns. (For LWS01 and LWS02 res is 0.29 um or 0.6 um, depending on if one is working shortward or longward of 90.5 um, respectively. For LWS03 and LWS04, res is found in Table 3, pg. 20 of the LWS Manual.)

This formulation assumes the line to be Gaussian and to be convolved by a Gaussian resolution element. The widths add in quadrature, and the ratio of the old to the new width scales the observed flux.