Header format description
======================================================================
Word	Bytes	Variable name	Description	Note
1		1-4		NX				number of columns in 3D data array (fast axis)	
2		5-8		NY				number of rows in 3D data array (medium axis)	
3		9-12	NZ				number of sections in 3D data array (slow axis)	
4		13-16	MODE	0 8-bit signed integer (range -128 to 127)
                        1 16-bit signed integer
                        2 32-bit signed real
                        3 transform : complex 16-bit integers
                        4 transform : complex 32-bit reals
                        6 16-bit unsigned integer	
5		17-20	NXSTART			location of first column in unit cell	
6		21-24	NYSTART			location of first row in unit cell	
7		25-28	NZSTART			location of first section in unit cell	
8		29-32	MX				sampling along X axis of unit cell	
9		33-36	MY				sampling along Y axis of unit cell	
10		37-40	MZ				sampling along Z axis of unit cell	
11-13	41-52	CELLA			cell dimensions in angstroms	
14-16	53-64	CELLB			cell angles in degrees	
17		65-68	MAPC			axis corresp to cols (1,2,3 for X,Y,Z)	
18		69-72	MAPR			axis corresp to rows (1,2,3 for X,Y,Z)	
19		73-76	MAPS			axis corresp to sections (1,2,3 for X,Y,Z)	
20		77-80	DMIN			minimum density value	
21		81-84	DMAX			maximum density value	
22		85-88	DMEAN			mean density value	
23		89-92	ISPG			space group number	
24		93-96	NSYMBT			size of extended header (which follows main header) in bytes	
25-49	97-196	EXTRA			extra space used for anything - 0 by default	
27		105		EXTTYP			code for the type of extended header	
28		109		NVERSION		version of the MRC format	
50-52	197-208	ORIGIN			phase origin (pixels) or origin of subvolume (A)	
53		209-212	MAP				character string 'MAP ' to identify file type	
54		213-216	MACHST			machine stamp encoding byte ordering of data	
55		217-220	RMS	rms			deviation of map from mean density	
56		221-224	NLABL			number of labels being used	
57-256	225-1024	LABEL(20,10)	10 80-character text labels

ts_16_bin8_lp80A_inv.mrc HEADER
======================================================================
NX:512
NY:720
NZ:224
MODE:2
NXSTART:0
NYSTART:0
NZSTART:0
MX:512
MY:720
MZ:224
CELLX:5570.56
CELLY:7833.6
CELLZ:2437.12
ALPHA:90
BETA:90
GAMMA:90
MAPC:1
MAPR:2
MAPS:3
DMIN:-71.6148
DMAX:72.9793
DMEAN:-4.07066
SPACEGROUP:1
EXTHEADER:222
EXTTYP:    
VERSION:0
X:201.159
Y:0
Z:-1302.88
MAP:MAP
LABELSCOUNT:10
LABEL:bimg -inv ts_16_bin4_lp80A.mrc ts_16_bin4_lp80A_inv.mrc
LABEL:
LABEL:
LABEL:
LABEL:
LABEL:
LABEL:
LABEL:
LABEL:
LABEL:BINVOL: Volume binned down by factors   2   2   2       18-Aug-20  21:49:37
