One telescope is located in Tucson and the other is located in Pasadena. What instrument related factor(s) must the researchers take into consideration so that they can reliably compare their spectral data when they are looking at the same object?
Are there any spectral observations that the pair of astronomers are unable to perform due to their instrument limitations?
Can you think of any other areas (medicine, science, defense, industry, etc.) where differences in detector spectral response must also be taken into consideration?