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Overview
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File format: VTP - Binary VTK (The Visualization Toolkit) Polydata. 
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Method of data collection: These files were generated either through
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aDaptive Constrained Constructive Optimization (CCO) or Partitioned aDaptive
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Constrained Optimization (PDCCO).
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Software: For viewing we should use ParaView. 
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Data variables and units of measurement
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Cell data: cylindrical vascular segment of fixed radius.
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ID_Vessel: Segment ID in the DCCO/PDCCO generation proccess.
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beta: Ratio of the segment vessel radius by its parent radius. For the root
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vessel we set beta=radius.
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branchingType: Determines the branching behaviour of the segment in the
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DCCO/PDCCO generation proccess. 0 for non-branching vessels, 1 for fixed vessels,
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2 for standard vessels, 3 for distal vessels. 
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eqResistance: Reduced hydrodinamic resistance of segment's vascular subtree.
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Either in 10^(-2)*Dyn*s*(cm)^-1 or 10^(-3)*Dyn*s*(cm)^-1.
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flow: Blood flow through vascular segment. Either in cm^3/s or mm^3/s.
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geoConst: length - 2*radius. Either in cm or in mm.
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lenght: Length of vascular segment. Either in cm or mm.
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level: The level of the segment in the vascular tree structure.
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pressure: Static blood pressure in segment. In 10^(-2)*dyn*cm^(-2).
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radius: Radius of vascular segment. Either in cm or mm.
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resistance: Reduced hydrodinamic resistance of vessel segment. Either in
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10^(-2)*Dyn*s*(cm)^-1 or 10^(-3)*Dyn*s*(cm)^-1.
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stage: DCCO or PDCCO generation stage.
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terminalType: 0 for common, 1 for reserved. Reserved means that the a
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predetermined fraction of flow passes through the segment.
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vesselFunction: 0 for distribution segment, 1 for perforator segment or 2 for
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transport segment. 
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viscosity: Dynamic viscosity of blood in this segment. In cP (centiPoise).
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strahler (if present): Strahler order of segment.
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subtreeVolume (if present): Volume of the subtree starting from this segment.
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Either in cm^3 or mm^3.
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strahlerConnectivity (if present): Strahler order of segment's parent. For the
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root segment we set this value to -1.
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Point data: vertices of each vascular segment.
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flow: Blood flow passing from that point. Either in cm^3/s or mm^3/s.
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isDistal: Whether that point is the proximal or distal vertice of the segment.
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isTerminal: Whether that point is a leaf node of the vascular tree.
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radius: Radius of segment. Either in cm^3/s or mm^3/s.
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