Magnetic field at the center of the cloud as a function of the central H₂ number density for the fiducial and random ICs models. The black and blue lines represent the fiducial and random ICs simulations, respectively, using a full chemical network. The red and purple lines represent the fiducial and random ICs simulations, respectively, using the method described in this paper. One can see that the function approaches a power law B ∝ ρ^k toward higher densities.