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A sill panel made of plastic extends in the longitudinal direction of the vehicle and is connected to the vehicle body. The sill panel is of an arched configuration and has an upper, upright fastening flange, which is connected to the vehicle body by fastening devices. Vertically oriented, upwardly

A sill panel made of plastic extends in the longitudinal direction of the vehicle and is connected to the vehicle body. The sill panel is of an arched configuration and has an upper, upright fastening flange, which is connected to the vehicle body by fastening devices. Vertically oriented, upwardly open slots are provided in the fastening flange, between the fastening devices.

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1. A sill panel assembly for a motor vehicle, comprising: a sill panel made of plastic and extending in a longitudinal direction of the motor vehicle between front and rear wheel cutouts and fastening devices at a plurality of positions spaced apart along the longitudinal direction for fastening the

1. A sill panel assembly for a motor vehicle, comprising: a sill panel made of plastic and extending in a longitudinal direction of the motor vehicle between front and rear wheel cutouts and fastening devices at a plurality of positions spaced apart along the longitudinal direction for fastening the sill panel to a metallic vehicle body of the motor vehicle, said sill panel being configured with an arched lower portion and an upper fastening flange extending up from the arched lower portion and offset from the arched lower portion, each of the arched lower portion and the upper fastening flange extending substantially from the front wheel cutout to the rear wheel cutout, the upper fastening flange being connected to the metallic vehicle body at corresponding fastening points by said fastening devices, said fastening flange having vertically oriented and upwardly open slots formed therein and in each case at least one of said slots is disposed between individual ones of said fastening devices, opposite longitudinal ends of the sill panel being formed respectively with shaped features having an outer panel offset outward of the metallic vehicle body and connecting panels extending toward the metallic vehicle body for defining U-shaped cross sections on said fastening flange, each of the shaped features having one of the vertically oriented and upwardly open slots formed therein, one of the fastening devices being on each longitudinal side of each of the shaped features. 2. The sill panel assembly according to claim 1, wherein said slots extend almost as far as a bottom of said fastening flange between said fastening devices and have rounded lower ends. 3. The sill panel assembly according to claim 1, wherein said slots are uniformly spaced with respect to one another and are each disposed immediately adjacent to one of said fastening devices and farther from all of the other fastening devices. 4. The sill panel assembly according to claim 1, wherein the slots in said fastening flange are each provided respectively immediately behind the fastening devices with respect to a forward direction of travel and at a spacing from said fastening devices. 5. The sill panel assembly according to claim 1, wherein said slots form between them in each case mutually corresponding zones to compensate for changes in length due to a high or low temperature effect. 6. The sill panel assembly according to claim 1, wherein each of said slots is disposed between two of said fastening devices. 7. The sill panel assembly according to claim 1, wherein: said fastening flange has a free upper edge; and said slots extend parallel to one another and extend at a right angle into said free upper edge of said fastening flange. 8. An elongated sill panel for a motor vehicle that has a metallic vehicle body, the elongated sill panel being formed from plastic and having a direction of elongation extending in a traveling direction of the motor vehicle between front and rear wheel cutouts, comprising: an elongated arched lower portion extending in the traveling direction of the motor vehicle from the front wheel cutout to the rear wheel cutout;an elongated upright fastening flange extending up from an upper side of the arched lower portion and joined continuously to the upper side of the arched lower portion from the front wheel cutout to the rear wheel cutout, the fastening flange further having a free upper edge on a longitudinal side of the fastening flange opposite the arched lower portion;a plurality fastening devices provided on the fastening flange at positions spaced apart along the traveling direction of the motor vehicle for fastening the sill panel to the metallic vehicle body of the motor vehicle;slots disposed between the fastening devices and extending from the free upper edge of the fastening flange to positions in proximity to the arched lower portion of the elongated sill panel, the slots being dimensioned and disposed to compensate for temperature related dimensional changes and corresponding stresses that could cause visible deformation of the sill panel; andopposite longitudinal ends of the sill panel being formed respectively with shaped features having an outer panel offset outward of the metallic vehicle body and connecting panels extending toward the metallic vehicle body for defining U-shaped cross sections on said fastening flange, each of the shaped features having one of the vertically oriented and upwardly open slots formed therein, one of the fastening devices being on each longitudinal side of each of the shaped features. 9. The elongated sill panel of claim 8, wherein the slots are substantially perpendicular to the free upper edge of the fastening flange. 10. The elongated sill panel of claim 8, wherein said slots are uniformly spaced with respect to one another. 11. A motor vehicle, comprising: a metallic vehicle body with front and rear wheel cutouts spaced apart along a traveling direction of the motor vehicle; anda sill panel formed from plastic and extending between the front and rear wheel cutouts, the sill panel including:an elongated arched lower portion extending in the traveling direction between the front and rear wheel cutouts of the motor vehicle;an elongated fastening flange projecting up from an upper side of the arched lower portion and joined continuously to the arched lower portion along the traveling direction between the front and rear wheel cutouts, the fastening flange further having a free upper edge on a longitudinal side of the fastening flange opposite the arched lower portion;a plurality fastening devices provided on the fastening flange at positions spaced apart along the traveling direction of the motor vehicle for fastening the sill panel to the metallic vehicle body of the motor vehicle;slots disposed between the fastening devices and extending from the free upper edge of the fastening flange to positions in proximity to the arched lower portion of the elongated sill panel, each of the slots being substantially adjacent one of the fastening devices and farther from all of the other fastening devices, the slots being dimensioned and disposed to compensate for temperature related dimensional changes and corresponding stresses that could cause visible deformation of the sill panel opposite longitudinal ends of the sill panel being formed respectively with shaped features having an outer panel offset outward of the metallic vehicle body and connecting panels extending toward the metallic vehicle body for defining U-shaped cross sections on said fastening flange, each of the shaped features having one of the vertically oriented and upwardly open slots formed therein, one of the fastening devices being on each longitudinal side of each of the shaped features. 12. The motor vehicle of claim 11, wherein the slots are substantially perpendicular to the free upper edge of the fastening flange. 13. The motor vehicle of claim 11, wherein the slots are uniformly spaced with respect to one another.