File Formats¶

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CCP4, MRC, and variants¶

byte offset	word offset (first=0)	word index (first=1)	field	type	description	CCP4	MRC-IMOD
0	0	1	N _x	int32	3-D size of data array, fastest changing first
4	1	2	N _y	int32
8	2	3	N _z	int32
12	3	4	mode	int32	data type: 0: signed 8-bit integer 1: signed 16-bit integer 2: 32-bit float 3: 16-bit complex integer 4: 32-bit complex float	additionally: 5: same as mode 0	additionally: 6: 16-bit unsigned integer 16: 3x8-bit unsigned int, RGB NOTE: mode 0 may be signed or unsigned depending on codes found at byte offset 152 and 156
16	4	5	Start _x	int32	number of the first element in each dimension, if this is a sub-array of another
20	5	6	Start _y	int32
24	6	7	Start _z	int32
28	7	8	Intervals _x	int32	number of grid intervals along each dimension
32	8	9	Intervals _y	int32
36	9	10	Intervals _z	int32
40	10	11	Cell Length _x	float32	cell length in angstrom
44	11	12	Cell Length _y	float32
48	12	13	Cell Length _z	float32
52	13	14	Cell Angle α	float32	cell angles in degrees		ignored by IMOD
56	14	15	Cell Angle β	float32
60	15	16	Cell Angle γ	float32
64	16	17	Column axis	int32	1 -> X 2 -> Y 3 -> Z
68	17	18	Row axis	int32
72	18	19	Section axis	int32
76	19	20	Minimum density	float32	statistics calculated from the data
80	20	21	Maximum density	float32
84	21	22	Mean density	float32

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