In the balanced condition, the values of the resistances of the four arms of a Wheatstone bridge are shown in the figure below. The resistance $$𝑅_3$$ has temperature coefficient 0.0004 $$^\circ C^{−1}$$. If the temperature of $$𝑅_3$$ is increased by 100 $$^\circ C$$, the voltage developed between 𝑆 and 𝑇 will be __________ volt.