wdata-format-concept.md

@@ -236,10 +236,17 @@ double z = z0 + dz*iz;
 // array index: 3d case
 int ixyz = iz + nz*iy + nz*ny*ix; 
 ```
+If `dx` is negative, then the x-coordinate has to be extracted from the additional binary file of the name `prefix__x.wdat`. For more information, see the implementation of function `wdata_get_x`(...) from our C library. The same applies to coordinates y and z. 
 
 ## Time
+```
+cycles                   10   # number of cycles (measurements)
+t0                        0   # time value for the first cycle
+dt                        1   # time interval between cycles
+                              # if dt` is negative, then the time should be extracted from the extra file `prefix__t.wdat`.
+```
 To compute the time associated with a given `icycle`, we use the formula
 ```
 time = t0 + dt * icycle;
 ``` 
-If `dt` is negative, then the `time` parameter has to be extracted from the additional binary file of the name `prefix__t.wdat`. For more information, see the implementation of function [`wdata_get_time`(...)](https://gitlab.fizyka.pw.edu.pl/wtools/wdata/-/blob/master/c/wdata.c#L562) from our C library.
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+If `dt` is negative, then the `time` parameter has to be extracted from the additional binary file of the name `prefix__t.wdat`. For more information, see the implementation of function `wdata_get_time`(...) from our C library.
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