Hello,

Recently, I had processed the following steps and went on jointcal to see if the preliminary wcs get by singleFrame has been modified by jointcal, (since I didn’t care about photometry, so I didn’t apply fgcm, after doing the jointcal, I have several folder:

```
jointcal_config
jointcal_log
jointcal_metadata
jointcalSkyWcsCatalog
metricvalue_jointcal_astrometry_collected_refStars
metricvalue_jointcal_astrometry_final_chi2
metricvalue_jointcal_astrometry_final_ndof
metricvalue_jointcal_astrometry_matched_fittedStars
metricvalue_jointcal_astrometry_prepared_ccdImages
metricvalue_jointcal_astrometry_prepared_fittedStars
metricvalue_jointcal_astrometry_prepared_refStars
packages
```

I guess the refine wcs is in the folder jointcalSkyWcsCatalog, but I didn’t see anything related to `astrometryVisitOrder`

, which may looks something like `wcsFitter.order`

? how can I make use of the prodects of jointcal if I want to see the difference between the wcs after jointcal and the wcs I add to the image, for example, like drawing a residuals picture with the calexp’s header:

```
CD1_1 = -9.16667771595781E-05 / Transformation matrix element
CD1_2 = 5.15526544546508E-09 / Transformation matrix element
CD2_1 = 5.56227633542663E-09 / Transformation matrix element
CD2_2 = 9.16673178574373E-05 / Transformation matrix element
RADESYS = 'ICRS ' / Reference frame for RA/DEC values
A_0_2 = -9.80673267324552E-10 / SIP forward distortion coeff
A_0_3 = -2.72980865075959E-13 / SIP forward distortion coeff
A_1_1 = 5.54550997892483E-11 / SIP forward distortion coeff
A_1_2 = -3.18339889442891E-13 / SIP forward distortion coeff
A_2_0 = 2.32882766104403E-10 / SIP forward distortion coeff
A_2_1 = 3.80937173253727E-13 / SIP forward distortion coeff
A_3_0 = -9.76192978252609E-14 / SIP forward distortion coeff
A_ORDER = 3 / SIP max order
B_0_2 = -1.2288963642008E-09 / SIP forward distortion coeff
B_0_3 = -4.97481033104037E-13 / SIP forward distortion coeff
B_1_1 = 1.06961533038474E-09 / SIP forward distortion coeff
B_1_2 = -5.41377016266849E-14 / SIP forward distortion coeff
B_2_0 = 1.17817861744078E-09 / SIP forward distortion coeff
B_2_1 = 1.36771340654977E-13 / SIP forward distortion coeff
B_3_0 = 3.1221673094437E-14 / SIP forward distortion coeff
B_ORDER = 3 / SIP max order
```

Thank you