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#### Table M.3 – Protocol Buffer descriptor of top-level structure of losslessly compressed JPEG stream
```protobuf
message Header {
optional uint64 width = 1;
optional uint64 height = 2;
required uint64 version_and_component_count_code = 3;
optional uint64 subsampling_code = 4;
}
message Jpeg {
required bytes signature = 1;
required Header header = 2;
optional bytes meta_data = 3;
optional bytes jpeg1_internals = 4;
optional bytes quant_data = 5;
optional bytes histogram_data = 6;
optional bytes dc_data = 7;
optional bytes ac_data = 8;
optional bytes original_jpg = 9;
}
```
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