Sentence:  A set of tables containing spectral intensities for 39000 lines of 70 elements , as observed in a <WSD>copper</WSD> matrix in a d-c arc , was completed and published . 
Meaning of the word marked with <WSD> tags:  a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor