This directory contains files for the tree networks used in the manuscript "Spectral graph theory efficiently characterises ventilation heterogeneity in airway networks" by C Whitfield et al. Publication details to follow. Each folder contains the network as labelled in the paper in two formats: - .vtk format - plain text format where it is split into 3 files with suffixes .branches .nodes and .termnodes - The .nodes file has 4 columns, the first is the node index and the other 3 are the (x,y,z) node coordinates in mm - The .branches file has 4 columns (ignoring extra info in following columns), which are the edge index, node in index, node out index and radius (mm) - The .termnodes file contains a list of node indices corresponding to terminal nodes of the tree. Each folder also contains the CT centerline data (identified by the suffix _CT) in .vtk format.