Update 04_adding_first_tectonic_feature.md

[jdannberg]

fix typo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a01bf98) 93.54% compared to head (cb745fd) 93.54%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #559   +/-   ##
=======================================
  Coverage   93.54%   93.54%           
=======================================
  Files          92       92           
  Lines        6340     6340           
=======================================
  Hits         5931     5931           
  Misses        409      409           

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.027 ± 0.003 (s=436)	1.030 ± 0.003 (s=441)	+0.3% .. +0.4%
Slab interpolation curved simple none	1.028 ± 0.004 (s=442)	1.027 ± 0.003 (s=437)	-0.2% .. -0.0%
Spherical slab interpolation simple none	1.262 ± 0.006 (s=373)	1.261 ± 0.006 (s=343)	-0.2% .. +0.0%
Slab interpolation simple curved CMS	1.095 ± 0.005 (s=412)	1.098 ± 0.005 (s=411)	+0.1% .. +0.3%
Spherical slab interpolation simple CMS	1.860 ± 0.007 (s=246)	1.856 ± 0.004 (s=241)	-0.3% .. -0.1%
Spherical fault interpolation simple none	1.274 ± 0.005 (s=351)	1.273 ± 0.004 (s=358)	-0.2% .. +0.0%
Cartesian min max surface	2.388 ± 0.042 (s=202)	2.388 ± 0.028 (s=177)	-0.5% .. +0.5%
Spherical min max surface	7.342 ± 0.022 (s=62)	7.355 ± 0.035 (s=63)	-0.1% .. +0.4%