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The role of data in managing complex low voltage networks. In terms of the data, a combination of an IT analysis and physical survey can resolve issues related to connectivity and specification. Data are often more easily available than it might seem when one is just looking at core systems.As the ventricle fills with blood, the pressure and volume that result from filling are determined by the compliance of the ventricle. Normally, compliance curves are plotted as the change in volume (ΔV) over the change in pressure (ΔP). For the ventricle, however, it is common to plot ΔP versus ΔV (see Figure).