A rectangular region in a solid is in a state of plane strain. The (x,y) coordinates of the corners of the undeformed rectangle are given by P(0,0), Q(4,0), R(4,3), S(0,3). The rectangle is subjected to uniform strains, ε_xx = 0.001, ε_yy = 0.002, γ_xy = 0.003. The deformed length of the elongated diagonal, upto three decimal places, is ________ units.