Dust extinction through the Ophiuchus molecular cloud, derived using the near-infrared extinction mapping technique and 2MASS data (Paper I). The contours are drawn at  mag, and at A_V = 1 mag which is used to calculate the total mass of the cloud. The mass in the dense component is ~21% of the mass above A_V = 1 mag in this cloud (cf. Table 1). The inset shows the column density PDF of the cloud, with an approximate log-normal function fitted to the peak of it.