warning x3206 implicit truncation of vector type

@Andrew_O_Bannon wrote:

1. float Percentage;

2. sampler TextureSampler: register(s0);

3. float4 PixelShaderFunction(float2 Tex: TEXCOORD0) : COLOR0
4. {
5. float4 Color = tex2D(TextureSampler, Tex);
6. float r = Color.r;
7. float g = Color.g;
8. float b = Color.b;
9. Color.rgb = dot(Color.rgb, float3(0.7 * Percentage, 0.59 * Percentage, 0.11 * Percentage));
10. r = r - (r - Color.rgb) * Percentage;
11. g = g - (g - Color.rgb) * Percentage;
12. b = b - (b - Color.rgb) * Percentage;
13. Color.r = r;
14. Color.g = g;

15. Color.b = b;

16. return Color;

17. }

18. technique tech

19. {
20. pass Pass1
21. {
22. PixelShader = compile ps_4_0_level_9_1
23. PixelShaderFunction();
24. }
25. }

I've been knocking around shaders in monogame and found this example. but it shows me a warning
"warning x3206 (13,2 - 37) implicit truncation of vector type
"warning x3206 (14,2 - 38) implicit truncation of vector type
"warning x3206 (15,2 - 37) implicit truncation of vector type"

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