Auxiliary-tools.md

-W-SLDA Toolkit provide various tools that may support computation and data analysis process.
+W-SLDA Toolkit provides various tools that may support the computation and data analysis process.
 In order to create them enter [tools](https://gitlab.fizyka.pw.edu.pl/wtools/wslda/-/tree/public/tools) folder and edit (if necessary) header of [Makefile](https://gitlab.fizyka.pw.edu.pl/wtools/wslda/-/blob/public/tools/Makefile). Next execute
 ```bash
 make
@@ -10,12 +10,16 @@ Executables will be written to `wslda/tools/bin` folder.
 ## wdata-cut 
 *Purpose*: extracts subset from existing wdata set.  
 
-In many cases for testing purposes it is sufficient to have only sample of data (for example to download it locally and test a code). You can use `wdata-cut` tool exatract a data sample. Syntax is following:  
+In many cases, for testing purposes, it is sufficient to have only a sample of data (for example to download it locally and test a code). You can use `wdata-cut` tool to extract a data sample. The syntax is following:  
 ```bash
+WDATA SUBSET EXTRACTOR
 Usage: ./wdata-cut file.wtxt outprefix start stop
+        or
+Usage: ./wdata-cut file.wtxt outprefix start stop stride
         file.wtxt    - metadata file
         outprefix    - for new files, metadata file will be written to outprefix.wtxt
         [start,stop) - range for subtructing cycles
+        stride       - every `stride` frame will be taken only from given range, default stride=1
 ```
 For example to extract the first cycle only:     
 ```bash
@@ -29,9 +33,9 @@ DONE.
 ```
 ## wdata-sample 
 
-*Purpose*: creates new data set, where only every `stride` measurment is present.  
+*Purpose*: creates new data set, where only every `stride` measurement is present.  
 
-This tool is very similar to `wdata-cut` tool with change that it strides the data set. Syntax is following:
+This tool is very similar to `wdata-cut` tool with change that it strides the data set. The syntax is following:
 ```bash
 Usage: wdata-sample file.wtxt outprefix stride
         file.wtxt    - metadata file
@@ -87,6 +91,13 @@ const                    eF                    0.72
 GENERATED `ufg1V0.6.wtxt`
 ```
 
+## dpca2wdata-hard
+*Purpose*: converts dpca file into wdata set. 
+```
+DPCA -> WDATA HARD CONVERTER
+Usage: ./dpca2wdata-hard prefix
+        prefix - prefix of dpca files
+``` 
 
 # st-wslda related tools
 ## wdata2checkpoint