Fix PDF export from VSCode

Format description.md

@@ -11,7 +11,7 @@ Second column is FF per engine in kg/hr
 Third column is IAS
 -  If single value, apply to all weights
 -  If multiple values, apply to respective weights (delimited with `,`)
--  
+ 
 Fourth column is MACH
 -  If single value, apply to all weights
 -  If multiple values, apply to respective weights (delimited with `,`)
@@ -28,7 +28,7 @@ First index is weight (equates to the lines in the file)
 Second index is CI (equates to the columns in a line)
 - Must be in range $[0, 999]$
   
-# Format of raw curves
+# Format for raw curve tables
 2d matrix of curve parameters
 
 Columns delimited with `;` \
@@ -46,4 +46,16 @@ $$
 $$
 Extract parameters $a,b,c$ from the table \
 $x$ is the CI and must be in range $[0,999]$ \
-$f(x)$ is the mach number for the given altitude, weight, CI, and MMO
+$f(x)$ is the mach number for the given altitude, weight, CI, and MMO
+
+# Conversion of weight to index
+
+$$f(x) = \frac{x - 140}{10}$$
+$x$ is weight (see range restrictions where applicable)\
+$f(x)$ is the resulting index for the LUTs
+
+# Conversion of altitude to index
+
+$$f(x) = \frac{x - 250}{20}$$
+$x$ is altitude (see range restrictions where applicable)\
+$f(x)$ is the resulting index for the LUTs