Portrait BBOX (51200x76800): Perfect.

[scan-portrait]
type=WMSLayer
layers=scan100,scan25
url=http://server/wms?
extension=jpg
tms_type=google
srs=EPSG:2154
bbox=920000,6400000,971200,6476800

TILECACHE
---------
150.0
75.0
37.5,
18.75,
9.375,
4.6875,
2.34375,
1.171875,
0.5859375,
0.29296875,
0.146484375,
0.0732421875,
0.03662109375,
0.018310546875,
0.0091552734375,
0.00457763671875,
0.00228881835938,
0.00114440917969,
0.000572204589844,
0.000286102294922,
                

            

            
            (TileCache resolutions printed from here)
        

        

            
Landscape BBOX (76800x51200): Offset!

            

            

            

                
[scan-landscape]
type=WMSLayer
layers=scan100,scan25
url=http://server/wms?
extension=jpg
tms_type=google
srs=EPSG:2154
bbox=920000,6400000,996800,6451200



TILECACHE
---------
150.0,
75.0,
37.5,
18.75,
9.375,
4.6875,
2.34375,
1.171875,
0.5859375,
0.29296875,
0.146484375,
0.0732421875,
0.03662109375,
0.018310546875,
0.0091552734375,
0.00457763671875,
0.00228881835938,
0.00114440917969,
0.000572204589844,
0.000286102294922,