Update spherex_data_products.md

Removed the lengths of the arrays used in WCS-WAVE, to make the description more evergreen.

Author: vandesai1

documentation/spherex_data_products.md

@@ -37,7 +37,7 @@ The SPHEREx focal plane is split with a dichroic to three short-wavelength and t
 
 5. **PSF** - 121 Point-spread functions (PSFs); each PSF is represented as a 101 x 101 image and all 121 are assembled together into a cube.
 
-6. **WCS-WAVE** - Spectral World Coordinate System (WCS) FITS-compliant lookup table that maps spectral image pixel coordinates to central wavelengths and bandwidths. The lookup table consists of 1 row with 3 columns (X, Y, VALUES). X and Y are each arrays of length 7, defining a 7x7 grid of control points in spectral image pixel space. VALUES is a 7x7 array of two-element arrays: at each (X, Y) control point, the two-element array contains the central wavelength and the corresponding bandwidth. Originally adopted to support the unique nature of the SPHEREx LVF filters, this rarely-used part of the FITS standard has yet to be implemented by all readers. If your FITS client software doesn't automatically recognize this, you can manually determine the central wavelength or bandwidth at an arbitrary pixel location by identifying the four nearest control points and applying bilinear interpolation. This method yields values accurate to within approximately 1 nm.  The information in the WCS-WAVE extension of the Spectral Image MEF is also provided in a stand-alone data product described below ("Additional Product: Spectral WCS").
+6. **WCS-WAVE** - Spectral World Coordinate System (WCS) FITS-compliant lookup table that maps spectral image pixel coordinates to central wavelengths and bandwidths. The lookup table consists of 1 row with 3 columns (X, Y, VALUES). X and Y are each arrays defining a grid of control points in spectral image pixel space. VALUES is an array of two-element arrays: at each (X, Y) control point, the two-element array contains the central wavelength and the corresponding bandwidth. Originally adopted to support the unique nature of the SPHEREx LVF filters, this rarely-used part of the FITS standard has yet to be implemented by all readers. If your FITS client software doesn't automatically recognize this, you can manually determine the central wavelength or bandwidth at an arbitrary pixel location by identifying the four nearest control points and applying bilinear interpolation. This method yields values accurate to within approximately 1 nm.  The information in the WCS-WAVE extension of the Spectral Image MEF is also provided in a stand-alone data product described below ("Additional Product: Spectral WCS").
 
 
 *Filename Format:*