Update README.md

README.md

@@ -2,7 +2,7 @@
 
 ## Description
 
-Python code for converting profilometry data from a Veeco Wyko NT9100 into another format for further processing. In the Veeco software, the file should be saved in ASC format.
+Python code for reading profilometry data from a Veeco Wyko NT9100,  preprocessing it, and saving it into another format for further processing. In the Veeco software, the file should be saved in ASC format.
 
 ## Usage
 
@@ -15,7 +15,11 @@ Illustration of the steps the code performs, form left to right: reading, cleani
 ![Illustration of the three steps, reading, cleaning, filling.](assets/Example.png)
 
 ## Functions
+The data passed between function is stored in a [NumPy array](https://numpy.org/doc/stable/reference/arrays.html).
 ### `extract_Wyko_ASCII_data`
+Simple usage, the only parameter is the input file name. It outputs the profilometry data, what I call the height field `hfld`, as well as an intensity field `ifld`. Here's an illustration of the intensity field from the data shown in the example above:
+![Illustration of an intensity field.](assets/Example_intensity.png)
+
 ### `removePeaks`
 ### `fill_novals`
 ### Saving functions