logdensity_2d# jeanspy.model.ProjectedExponentialModel.logdensity_2d Class and construction: ProjectedExponentialModel. ProjectedExponentialModel.logdensity_2d(R_pc)[source]# Evaluate natural log projected density. Notes Inputs and units. R_pc in pc; scalar or NumPy array. Returns and shape. Natural log of the numerical surface density in pc^-2, with input shape. This excludes the radial Jacobian 2*pi*R.