1592952549000 1312632483000 term-2983 1616541157505 1312632487000 1616289905498 adlib fitz-online adlib-term-2983 4a0bdfa1-74bf-3208-8f0a-8a368ce84013 2 1 spectra, electromagnetic spectra, electromagnetic term reference term-3139 adlib-term-3139 1139ddbf-45c2-3ecb-9c21-766210837c3e electromagnetic radiation