Use the figure shown below to complete the following statement: A high-mass protostar remains roughly constant in ________ and increases in ________ as it follows its evolutionary track. 
Definitions:
Ppm Range
Stands for "parts per million," a unit of concentration that denotes the number of parts of a substance in a million parts of a different substance, often used in chemistry.
Cyclopentane
A saturated cyclic hydrocarbon with the molecular formula C5H10, containing a single five-membered ring.
Proton Spin Decoupled
In NMR spectroscopy, it refers to a technique to simplify spectral analysis by removing the interactions (couplings) between a proton's (H-atom's) spin and the spins of adjacent atoms.
Off-Resonance Decoupled
A technique in nuclear magnetic resonance (NMR) spectroscopy used to simplify spectra by removing certain interactions.
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