# data[].attributes.attachment_link.description
Only particles that pass undeflected through the velocity selector enter the mass separator, which is simply a region with a uniform magnetic field directed out of the page. The radius of the path followed by a particle is proportional to the mass of the particle, so particles are separated by mass.

# data[].attributes.headline
1 - Mass spectrometer and speed selector

# data[].attributes.subject
1 - Mass spectrometer and speed selector