access-to-data.md

@@ -24,6 +24,8 @@ pip install --index http://devpi.sbnb.org:3141/root/prod/ chemicalchecker
 
 ## Usage
 
+### Focusing on one molecule
+
 Let's get started by simply fetching 2D chemical information for a molecule of interest.
 
 ```python
@@ -37,6 +39,16 @@ cc.fetch(inchikey = ik, dataset = "A1.001", type = "sign1")
 To directly extract the exemplary signature, we may simply do:
 
 ```python
-cc.fetch(inchikey = "ik", dataset = "A1", type = "sign1")
+cc.fetch(inchikey = ik, dataset = "A1", type = "sign1")
+```
+
+### Focusing on one dataset
+
+Now let's focus on a certain dataset of interest. Say, for instance, that we want signatures of type 2.
+
+```python
+ds = "B1.001"
+
+cc.fetch(dataset = ds, type = "sign2")
 ```
  
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