Diagnostic plot of the astrometric alignment between the JWST NIRCam F200W (SW) and F277W (LW) images. The black points in the scatter plot show the source position offsets in the F200W and F277W 40 mas pixel⁻¹ mosaic images. The red circle denotes the median astrometric offset, which is consistent with zero. The histograms show the distribution of offsets in R.A. (Δα) and decl. (Δδ). We find 99% of all sources detected in these images have positional offsets smaller than 10 mas, with an rms of 22 mas. Restricting the sample to bright (SNR > 10), compact (FWHM < 0﹩\mathop{.}\limits^{\unicode{x02033}}﹩1) sources yields an rms of just 8 mas, demonstrating excellent astrometric alignment.