# Composition and the burning clock

Stored parcel trajectories are linearly sampled in physical time, preserving nonnegative mass fractions and the baryon invariant. The density-compensated case raises the resonance by 39.9 keV and increases density by the derived exponential factor. It is a controlled parcel identity, not a stellar density prediction.

Baseline and perturbed helium, carbon and oxygen fractions can be compared at the same elapsed time or helium depletion. Density compensation nearly restores composition while changing the clock.

## raised · Equal elapsed time

Thirteen alpha-chain species; T=0.2 GK. Reverse reactions included, screening off. Ended tracks remain at the saved endpoint.

First: Baseline: 0 yr, helium 1.000 · raised: 0 yr, helium 1.000

Last: Baseline: 2.53e+04 yr, helium 0.001 · raised: 5.76e+04 yr, helium 0.001

## raised · Equal helium consumption

Thirteen alpha-chain species; T=0.2 GK. Reverse reactions included, screening off. Ended tracks remain at the saved endpoint.

First: Baseline: 0 yr, helium 1.000 · raised: 0 yr, helium 1.000

Last: Baseline: 2.53e+04 yr, helium 0.001 · raised: 5.76e+04 yr, helium 0.001

## lowered · Equal elapsed time

Thirteen alpha-chain species; T=0.2 GK. Reverse reactions included, screening off. Ended tracks remain at the saved endpoint.

First: Baseline: 0 yr, helium 1.000 · lowered: 0 yr, helium 1.000

Last: Baseline: 2.53e+04 yr, helium 0.001 · lowered: 1.51e+04 yr, helium 0.001

## lowered · Equal helium consumption

Thirteen alpha-chain species; T=0.2 GK. Reverse reactions included, screening off. Ended tracks remain at the saved endpoint.

First: Baseline: 0 yr, helium 1.000 · lowered: 0 yr, helium 1.000

Last: Baseline: 2.53e+04 yr, helium 0.001 · lowered: 1.51e+04 yr, helium 0.001

## density-compensated · Equal elapsed time

Thirteen alpha-chain species; T=0.2 GK. Reverse reactions included, screening off. Ended tracks remain at the saved endpoint.

First: Baseline: 0 yr, helium 1.000 · density-compensated: 0 yr, helium 1.000

Last: Baseline: 2.53e+04 yr, helium 0.001 · density-compensated: 2.5e+03 yr, helium 0.001

## density-compensated · Equal helium consumption

Thirteen alpha-chain species; T=0.2 GK. Reverse reactions included, screening off. Ended tracks remain at the saved endpoint.

First: Baseline: 0 yr, helium 1.000 · density-compensated: 0 yr, helium 1.000

Last: Baseline: 2.53e+04 yr, helium 0.001 · density-compensated: 2.5e+03 yr, helium 0.001