VectorAround
VectorAround[{x1,x2,…},{δ1,δ2,…}] represents a vector of uncorrelated approximate numbers or quantities with values xi and uncertainties δi.
VectorAround[{x1,x2,…},{{Δ11,Δ12,…},{Δ12,Δ22,…},…}] represents a vector of approximate numbers or quantities with values xi and covariance matrix Δ.
VectorAround[{x1,x2},{{δ1,δ2},ρ}] represents a pair of approximate numbers or quantities with uncertainties δ1, δ2 and correlation factor ρ.
VectorAround[{x1,x2,…},{{δ1,δ2,…},{{1,R12,…},{R12,1,…},…}}] represents a vector of approximate numbers or quantities with uncertainties δi and correlation matrix R.
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