Damped least squares, trade-off curve কী?

For a damping parameter $\varepsilon > 0$, the damped least squares estimate is the model that minimises

The trade-off curve is the curve traced, as $\varepsilon$ varies, by the pair (size of the model $\|\mathbf m_\varepsilon\|$, misfit $\chi^2(\mathbf m_\varepsilon)$): small damping fits the data closely with a large, rough model, large damping gives a small model and a poor fit.