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