This update briefly reports new measurements and analysis that are used to determine the noise equivalent absorbance for the FM-DIAL system. The modeling work that is performed in parallel while the LIDAR experiments provides a useful benchmark to predict the performance of an experimental setup, and a detection sensitivity to strive to realize. Often, the theoretical performance is difficult to obtain experimentally, but with careful design experiments can come close to being limited by fundamental noise sources. The basic idea behind the experiments in this work consists of directing a laser toward a scattering target, and collecting the scattered photons using a telescope. This is very similar to just having a laser traversing a long path length absorption cell, and the emerging beam imaged onto a detector. In these types of experiments the conversion to concentration is performed using Beer?s law. The absorbance is given as: