MI-L How to get rid of grid's relief shading?

[Jaromir Svasta]

When I enabled the relief shading for an elevation grid (via Map > Modify  
Thematic Layer > Styles), the size of the MIG file rised from 50 to 280(!)  
MB. So I turned the shading off and closed the map window, but the size  
remains that huge. Furthermore: after closing the table and reopening it  
the shading is on again! Repeated it several times with no luck. I even  
edited the TAB file and removed the folowing metadata sentences:

"\Relief Shading" = ""
"\Relief Shading\Horizontal Angle" = "135"
"\Relief Shading\Vertical Angle" = "45"
"\Relief Shading\Vertical Scale Factor" = "50"
No help...
The same happens with USGS DEM files, except that the DEM file does not  
rise in size, but a new (huge) file MIH is created.
The only solution is to remove the shading temporarily by issuing "Set Map  
Layer 1 Relief Off" in the mapbasic window, but this is not what I am  
searching for - I want my 230 MB back!

Any help?
P.S.
In the TAB file there is a sentence "RasterStyle 6 1", removing which  
makes MIG unreadable by MapInfo. What is the meaning of the RasterStyle  
clause?

--
Jaromir SVASTA
Hydrogeologist
Geological Survey of Slovak Republic
Mlynska dolina 1
917 04 Bratislava
Slovak Republic
Tel: +421 2 59375326
Fax: +421 2 54771940
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