how-to-use.md

@@ -37,7 +37,7 @@ pm$aplot(option1=value1, ..., optionN=valueN)
 
 ```
 
-Options can be **passed directly** to the command line or to the functions plot and aplot or can be **stored in configuration files** stored according  to the following standard:
+Options can be **passed directly** to the command line or to the functions *plot* and *aplot* or can be **stored in configuration files** according  to the following standard:
 
 ```
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