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This very small PR fixes the settings of position and covariance matrix of the vertex constraint in the VertexFitterAlgorithm.hpp. When I ran the Billoir fitter with the old settings, I got the following errors:
14:15:37 VertexFit ERROR Error in vertex fit with constraint.
14:15:37 VertexFit ERROR Numeric failure in calculation.
Looking at the FullBilloirVertexFitterTests.cpp in /Tests/UnitTests/Core/Vertexing, showed that the constraints had a dimension missing (and also wrong units), which resolved the issue.