Complex sentence: Measuring the deuterium/hydrogen ratio will allow an estimation of the amount of water loss to outer space.Nominal plan to operate LAP is between the ranges of approximately 3,000 km before Mars periapsis to 3,000 km after Mars periapsis.
Split into simpler sentences: Measuring the deuterium/hydrogen ratio will allow an estimation of the amount of water loss to outer space. The nominal plan to operate LAP is between the ranges of approximately 3,000 km before Mars periapsis to 3,000 km after Mars periapsis.