A method may include emitting a band of electromagnetic (EM) radiation towards a specimen that covers at least a first and a second wavelength of EM radiation. The method may also include receiving, at a first receiver configured to receive the first wavelength of EM radiation, responses to the EM radiation after the EM radiation interacts with the specimen； and receiving, at a second receiver configured to receive the second wavelength of EM radiation, responses to the EM radiation after the EM radiation interacts with the specimen. The method may also include extracting markers from a combination of first signals representative of the received responses at the first receiver and second signals representative of the received responses at the second receiver, the extracting including replicating and mixing the first signals and the second signals to extract the plurality of markers.
