In an electrostatic field, the electric displacement density vector, D⃗, is given by
D⃗(x, y, z) = (x³ î + y³ ĵ + xy² k̂) C/m²,
where î, ĵ, k̂ are the unit vectors along x-axis, y-axis, and z-axis, respectively.
Consider a cubical region R centered at the origin with each side of length 1 m, and vertices at (±0.5 m, ±0.5 m, ±0.5 m). The electric charge enclosed within R is _________ C (rounded off to two decimal places).