The alpha channel of the entry, the range of this depends on the sampleDepth of the palette:
The blue channel of the entry, the range of this depends on the sampleDepth of the palette:
The frequency of the entry which is proportional to the amount of pixels in the image that use the entry. The scale of the frequency is up to the encoder.
The green channel of the entry, the range of this depends on the sampleDepth of the palette:
The red channel of the entry, the range of this depends on the sampleDepth of the palette:
A suggested palette entry.