Sentence:  In free burning electric arcs , for instance , approximately 90 % of the total arc power is transferred to the anode giving rise to local heat fluxes in excess of **f as measured by the authors - the <WSD>exact</WSD> value depending on the arc atmosphere . 
Meaning of the word marked with <WSD> tags:  (of ideas, images, representations, expressions) characterized by perfect conformity to fact or truth; strictly correct