diff --git a/doc/research.md b/doc/research.md
index d4d7fd8..5fc5625 100644
--- a/doc/research.md
+++ b/doc/research.md
@@ -77,6 +77,12 @@ Based on Figure 27 from SRC1, and Figure 28 using the middle of the 3 temperatur
 | -115 | 200 | 110 |
 | -125 | 400 | 120 |
 
+### Regression analysis
+
+- 350km-850km: `p[bar](a[km]) = e^(−8.0920583983 − 0.0066339143 * a)`
+- 50km-350km: `p[bar](a[km]) = e^(0.0626589359 − 0.0473755348 * a)`
+- -125km-50km: `p[bar](a[km]) = e^(0.0626589359 − 0.0473755348 * a)`
+
 ### Designing the in-game atmosphere
 
 New mechanics: