4-CAIVS-user-guide/4.1-Purpose.md

-![logo_short_small](uploads/1e4ee858ca174663b210647640da0976/logo_short_small.png) `4`
+![logo_short_small](uploads/1e4ee858ca174663b210647640da0976/logo_short_small.png) `4.1`
 
 CAIVS is a converter for NIRVANA snapshot files (`NIR#.#`; cf.
 [NIRVANA: snapshot files](https://gitlab.aip.de/ziegler/NIRVANA/-/wikis/3-NIRVANA-user-guide/3.3-Output-data#snapshot-files)) into data
@@ -18,7 +18,7 @@ second example, an adaptive mesh can be transformed onto a unigrid with
 resolution equivalent to some refinement level of the original mesh.
 
 Output files produced by CAIVS get names `#.format` where `#` is a
-user-specified number, and the suffix `format`∈{`nir`,`silo`,`csv`,`h5`}
+user-specified number, and the suffix `format`∈{`nir`,`silo`,`csv`,`h5`,`raw`}
 stands for one of the possible output formats. If variables are
 requested to be written out in separate files (cf. 
 [Specification of parameters](4.2-User-interfaces#specification-of-parameters)) 
@@ -97,6 +97,15 @@ library and the configuration of the CAIVS makefile `Makefile_CAIVS`
 located in directory `/caivs/bin` (cf. 
 [Quick tutorial](2-Getting-started#quick-tutorial)).*
 
+#### RAW (`#.raw`)
+
+In the RAW output file format data arrays of variables are written out in binary
+form without any metadata and without grid structure information. This output
+format may be only useful for data from uniform grid simulations
+using a visualization tool which allows to separately specify grid information
+by hand
+(e.g. [Vapor](https://www.vapor.ucar.edu)).
+
  
 
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