## SNR: Final Fit

# Final Fit

Now, plot the data to see how well your new model appear to fit the data. Remember to use the easyplot command:

easyplot 0.25 5.0

Screen capture of the POW plot window showing the results of the fitting the revised model with three Gaussian emission lines.

### Answer these questions about your current model and plot:

- Note the chi-squared for this fit.
- How has the chi-squared changed since your first model? Does this change indicate that the fit is better or worse?
- How has the chi-squared changed since you added the two final Gaussians? Does this change indicate that the fit is better or worse?
- Looking at your plot, how well does the model match the peaks in the data? How has the fit of the model to the data changed since your first plot?
- Do you think that you have found the best model for these data? Why or why not?
- If not, then describe what features of the data the model seems to be missing.