This describes the typical FITS header information that the program "regress_plane_calc.c" and "regress_plane_calc_eikonal.c" requires.
| BITPIX = 16 | requires that the pixel values be integers |
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| NAXIS = 4 | the input must be in this form with real and imaginary components held in the fourth dimension |
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| BSCALE | is the scaling of the pixel values |
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| DAXIS1 | is the spatial scaling of the pixels in the x-direction in units of Solar radii |
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| DAXIS2 | is the spatial scaling of the pixels in the y-direction in units of Solar radii |
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| DAXIS3 | is the scaling of the pixels in the nu-direction in units of Hertz |
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| DAXIS4 | is the scaling of the pixels in the fourth-dimension |
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| OBS_L0 | is the longitude that SOHO-MDI is observing at the time of the midpoint observation of the datacube |
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| OBS_B0 | is the latitude that SOHO-MDI is observing at the time of the midpoint observation of the datacube |
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| REF_L0 | is the central longitude of the datacube |
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| REF_B0 | is the central latitude of the datacube |
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| X0 | is where the REF_L0 and REF_B0 are located in the x-direction in pixels. |
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| Y0 | is where the REF_L0 and REF_B0 are located in the y-direction in pixels. |
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| TIME0 | is the time of the beginning of the observation |
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| DTIME | is the total duration of the observation in seconds |
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| Z1 | is the frequency of the first frame in Hertz |
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