Accuracy and precision evaluation plots for parameters contributing to a line flux’s nominal and standard deviation values: line amplitude (A_gas), standard deviation (σ_gas), line flux noise (σ_noise), and spectrum resolution (∆λ_inst). The black solid line indicates the emission line detection boundary, and dashed lines represent the cosmic rays (or dead pixel) “lines” limit. Each circle represents the Gaussian fitting of a synthetic line. Left: points are color-coded by the absolute relative error between measured and true flux. Inset histogram shows relative error of integrated and Gaussian fluxes. Red crosses indicate points where LIME Gaussian fitting failed. Right: points color-coded by coefficient of variation for Gaussian uncertainty and nominal flux. Inset histogram shows difference between Gaussian and integrated fluxes against true coefficient of variation.