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COLOR syntax of pixel shader

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COLOR syntax of pixel shader If I use the "return 0.7f", it means what value of color? float4(0,0,0.7f,1.0f) or float4(0.7f,0.7f,0.7f,0.7f)? Somebody know where the reule and value of color definition(:COLOR) of pixel shader in MSDN? float4 c1=0.5f; the value is equal to the value of float4(0.5f,0.5f,0.5f,0.5f)?
float4 UpdateShadowResultTextureForDeferredShadingPS(Ps_TC_IN IN) : COLOR
	return 0.7;
	return float4(0,0,0.7f,1.0f);

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