A fairly self explanatory header. Some additional notes on the parameters are shown below. The major difference is that the MAPSCALE is different to the normal MDI headers.

---------------------------------------------------------------

SIMPLE  =                    T / Fits standard                                  
BITPIX  =                   16 / Bits per pixel                                 
NAXIS   =                    3 / Number of axes                                 
NAXIS1  =                  512 / Axis length                                    
NAXIS2  =                  512 / Axis length                                    
NAXIS3  =                 3360 / Axis length                                    
EXTEND  =                    F / File may contain extensions                    
IRAF-TLM= '07:45:23 (16/11/2003)' / Time of last modification                   
BSCALE  =   1.000000000000E+00                                                  
BZERO   =   0.000000000000E+00                                                  
BLANK   =               -32768                                                  
HISTORY created by fastrack Sat Nov 15 21:59:38 2003                            
ORIGIN  = 'SOI Science Support Center' / SOI SDS V 4.5                          
AUTHOR  = 'Tom Duvall'                                                          
DATE    = '2003-11-16'         / file creation date                             
T_START = '2000.11.22_14:29:58.0_UT' / nominal                                  
T_STOP  = '2000.11.24_22:28:58.0_UT' / nominal                                  
T_STEP  = '1minute '                                                            
T_REC   = '2000.11.23_18:29:28.0_UT' / midpoint of nominal interval             
T_FIRST = '2000.11.22_14:29:58.0_UT' / for first actual image (before masking)  
T_LAST  = '2000.11.24_22:28:58.0_UT' / for last actual image (before masking)   
T_OBS   = '2000.11.23_18:29:28.0_UT' / midpoint of first and last images        
MIN_CONE=   0.000000000000E+00 / radius of tracked region (degree)              
MAPSCALE=   3.400000000000E-02 / degree / pixel                                 
MAP_PROJ= 'Postels '                                                            
TRACKOPT= 'Eulerian'                                                            
MERID_V =   0.000000000000E+00 / microradian / sec                              
TRACK_A0=   8.240000000000E-02 / microradian / sec                              
TRACK_A2=  -3.441000000000E-01 / sin**2(lat) term                               
TRACK_A4=  -5.037000000000E-01 / sin**4(lat) term                               
BACKGRND= '/scr33/duvall/Nov00/Bkgd/hr_Vm_69207_fit.fits' / average image subtra
HG_LAT  =   1.850000000000E+01 / degree (at map center)                         
HG_LONG =   3.590000000000E+02 / degree (at map center)                         
                                                                              
END               
 
----------------------------------------------------------------
  

SIMPLE  	Mandatory. File type. Mandatory in primary header. Must 
		be F(alse) if the file does not conform to the FITS 
		standard, otherwise T(rue). Must be first keyword in 
		header.  

BITPIX  	Mandatory FITS data type. Must be second keyword 
		in header. 
BSCALE  	Scaling factor to convert data to float.  FITS only.
BZERO   	Offset applied to true pixel values.  FITS only.
	        physical_value = fits_pixel_value*bscale + bzero
NAXIS   	Mandatory. Number of axes. Must be third keyword in header. 
NAXIS1  	Mandatory. Size of first dimension. Must follow NAXIS 
		in header.
NAXIS2  	Mandatory. Size of second dimension. Must follow NAXIS1 
		in header.

T_FIRST 	UT start time of observation (center of averaging 
		interval).
T_LAST  	UT end time of observation (center of averaging 
		interval). 
T_OBS  		Actual (center) of integration time.
T_REC   	Intended observation time.
T_START 	Beginning time of first image in a data set.          
T_STOP  	Just past ending time of last image in a data set.   
MAPSCALE	Scale of maps in heliographic degrees / pixel at an
                appropriate location.
MAP_PROJ        Type of projection used.
TRACKOPT        Type of tracking used.
MERID_V 
TRACK_A0        a0, a2, and a4 are the coefficients in a                         
TRACK_A2	sin^2  (latitude)  expansion of the dif-                        
TRACK_A4	ferential rotation rate, minus the  Car-
                rington  rotation, in microradian / sec.
                Thus,  if  they   are   all   0,   rigid
                Carrington  rotation  is  assumed.
BACKGRND        A background image subtracted from the dataset.
HG_LAT          The heliographic latitude of map centre. The zero
		latitude is defined as the solar equator, increasing
		to +90 degrees towards the North and decreasing to 
		-90 degrees towards the South.
HG_LONG		The heliographic longitude of map centre.The zero 
                longitude is defined as the longitude that passed 
                through the ascending node of the solar equator on 
                the ecliptic plane on 1 January, 1854 at 12 UT 
                (Julian day = 2398220.0). The longitudes are also 
                known as Carrington longitudes.
TSAM            ???
MEANBACK	Mean value of the background image.
FIXED		???

  

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