# Growth Curve Report

The optional parameter `--verbose` to `gphot` invokes addiding of GROWFUNC and GROWDATA extension to all files together with plotting results to a graphical PNG file.

GROWFUNC extension
Column | Description |
--- | --- | ---
R | radius | pix
GROWCURVE | growth curve value at R |
RADIALPROFILE | Radial profile at R |

GROWFUNC tabulates growth-curve at more sampled radiuses than extension GROWCURVE contains. The curve is interpolated by smoothing cubic spline from the derived curve.

GROWDATA extension
Column | Description
--- | ---
GROWCURVEi | Empirical growth-curve for i-th aperture.
GROWCURVEERRi | Statistical error of GROWCURVE
RESGROWi | Residuals.

GROWDATA extension stores empirical growth-curves of stars on image. Growth curves of all stars are plotted in light blue, ones used for growth-curve construction in dark blue. Residuals between final curve and the data are plotted by RESGROW column. Order number in GROWDATA refers to GROWPHOT extension.

An example of growth-curve report image.

## See Also

Growth Curve Overview.