Description:  The E13 MFRSR developed a shading problem on or about 98/05/04. (The exact date when this
problem started is difficult to pin down exactly.) The shading problem is easy to
identify on a clear day because plots of direct beam and diffuse irradiance versus time become
"fuzzy". The total irradiance is not affected.
In response to the shading problem, a whole sequence of events then ensued: these actions
were designed to solve the shading problem but did not succeed until the very end.
Here's a rundown of what took place:
98/05/11  shadowband adjustment was made at 1544 GMT
 this adjustment corrected the shading problem that
occurred in the morning, but inadvertently caused
a PM shading problem
98/05/20  shadowband adjustment at 1804 GMT
98/05/21  shadowband adjustment at 1630 GMT
98/06/01  shadowband adjustment at 1910 GMT
98/06/02  shadowband adjustmnet at 1550 GMT
Alas, these adjustments did not solve the shading problem and
it seemed to get worse (for example, on 98/06/11 the shading
is VERY BAD from sunup until about 1500 LST).
98/06/16  shadowband adjustment at 1715 GMT
This final adjustment seems to a solved the problem! 
Measurements:  sgpmfrsrod1barnmichE13.c1:  extraterrestrial spectral irradiance used for optical depth calculations,
corrected for eccentricity of earth\'s orbit(io_filter2)  total optical depth direct narrowband filter 3(total_optical_depth_filter3)
 totaloptical depth direct narrowband filter 2(total_optical_depth_filter2)
 angstrom exponent(angstrom_exponent)
 aerosol optical depth filter 1(aerosol_optical_depth_filter1)
 aerosol optical depth filter 2(aerosol_optical_depth_filter2)
 aerosol optical depth filter 3(aerosol_optical_depth_filter3)
 total optical depth direct narrowband filter 5(total_optical_depth_filter5)
 aerosol optical depth filter 5(aerosol_optical_depth_filter5)
 total optical depth direct narrowband filter 4(total_optical_depth_filter4)
 aerosol optical depth filter 4(aerosol_optical_depth_filter4)
 extraterrestrial spectral irradiance used for optical depth calculations,
corrected for eccentricity of earth\'s orbit(io_filter4)  total optical depth direct narrowband filter 1(total_optical_depth_filter1)
 extraterrestrial spectral irradiance used for optical depth calculations,
corrected for eccentricity of earth\'s orbit(io_filter5)  extraterrestrial spectral irradiance used for optical depth calculations,
corrected for eccentricity of earth\'s orbit(io_filter3)  extraterrestrial spectral irradiance used for optical depth calculations,
corrected for eccentricity of earth\'s orbit(io_filter1)
sgpmfrsrE13.b1:  Narrowband Diffuse Hemispheric Irradiance, Filter 6(diffuse_hemisp_narrowband_filter6)
 Direct Normal Broadband Irradiance(direct_normal_broadband)
 Narrowband Direct Normal Irradiance, Filter 5(direct_normal_narrowband_filter5)
 Narrowband Diffuse Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3)
 Narrowband Diffuse Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
 Narrowband Diffuse Hemispheric Irradiance, Filter 5(diffuse_hemisp_narrowband_filter5)
 Narrowband Direct Normal Irradiance, Filter 3(direct_normal_narrowband_filter3)
 Narrowband Direct Normal Irradiance, Filter 2(direct_normal_narrowband_filter2)
 Narrowband Direct Normal Irradiance, Filter 1(direct_normal_narrowband_filter1)
 Narrowband Direct Normal Irradiance, Filter 6(direct_normal_narrowband_filter6)
 Narrowband Direct Normal Irradiance, Filter 4(direct_normal_narrowband_filter4)
 Diffuse Hemispheric Broadband Irradiance (Approximate), MFRSR(diffuse_hemisp_broadband)
 Narrowband Diffuse Hemispheric Irradiance, Filter 2(diffuse_hemisp_narrowband_filter2)
 Narrowband Diffuse Hemispheric Irradiance, Filter 1(diffuse_hemisp_narrowband_filter1)
sgpmfrsrE13.a0:  Narrowband Direct Normal Irradiance, Filter 4(direct_normal_narrowband_filter4)
 Narrowband Direct Normal Irradiance, Filter 5(direct_normal_narrowband_filter5)
 Narrowband Diffuse Hemispheric Irradiance, Filter 4(diffuse_hemisp_narrowband_filter4)
 Narrowband Direct Normal Irradiance, Filter 6(direct_normal_narrowband_filter6)
 Narrowband Diffuse Hemispheric Irradiance, Filter 5(diffuse_hemisp_narrowband_filter5)
 Narrowband Diffuse Hemispheric Irradiance, Filter 6(diffuse_hemisp_narrowband_filter6)
 Narrowband Direct Normal Irradiance, Filter 3(direct_normal_narrowband_filter3)
 Narrowband Direct Normal Irradiance, Filter 2(direct_normal_narrowband_filter2)
 Narrowband Direct Normal Irradiance, Filter 1(direct_normal_narrowband_filter1)
 Narrowband Diffuse Hemispheric Irradiance, Filter 3(diffuse_hemisp_narrowband_filter3)
 Narrowband Diffuse Hemispheric Irradiance, Filter 2(diffuse_hemisp_narrowband_filter2)
 Narrowband Diffuse Hemispheric Irradiance, Filter 1(diffuse_hemisp_narrowband_filter1)
 Direct Normal Broadband Irradiance(direct_normal_broadband)
 Diffuse Hemispheric Broadband Irradiance (Approximate), MFRSR(diffuse_hemisp_broadband)
sgpmfrsrlangplotE13.c1:  rejected points for the final fit for the Direct Narrowband Filter1(michalsky_rejected_filter1)
 rejected points for the final fit for the Direct Broadband(barnard_rejected_broadband)
 log(irradiance) for the Direct Narrowband Filter6(barnard_lnI_filter6)
 log(irradiance) for the Direct Broadband(barnard_lnI_broadband)
 rejected points for the final fit for the Direct Narrowband Filter6(barnard_rejected_filter6)
 log(irradiance) for the Direct Narrowband Filter2(barnard_lnI_filter2)
 log(irradiance) for the Direct Narrowband Filter3(barnard_lnI_filter3)
 log(irradiance) for the Direct Narrowband Filter1(michalsky_lnI_filter1)
 log(irradiance) for the Direct Narrowband Filter5(barnard_lnI_filter5)
 log(irradiance) for the Direct Narrowband Filter3(michalsky_lnI_filter3)
 rejected points for the final fit for the Direct Narrowband Filter2(barnard_rejected_filter2)
 log(irradiance) for the Direct Broadband(michalsky_lnI_broadband)
 log(irradiance) for the Direct Narrowband Filter4(barnard_lnI_filter4)
 log(irradiance) for the Direct Narrowband Filter4(michalsky_lnI_filter4)
 log(irradiance) for the Direct Narrowband Filter6(michalsky_lnI_filter6)
 rejected points for the final fit for the Direct Narrowband Filter3(barnard_rejected_filter3)
 rejected points for the final fit for the Direct Narrowband Filter4(barnard_rejected_filter4)
 rejected points for the final fit for the Direct Narrowband Filter1(barnard_rejected_filter1)
 log(irradiance) for the Direct Narrowband Filter2(michalsky_lnI_filter2)
 rejected points for the final fit for the Direct Narrowband Filter5(michalsky_rejected_filter5)
 log(irradiance) for the Direct Narrowband Filter1(barnard_lnI_filter1)
 rejected points for the final fit for the Direct Narrowband Filter6(michalsky_rejected_filter6)
 rejected points for the final fit for the Direct Narrowband Filter5(barnard_rejected_filter5)
 log(irradiance) for the Direct Narrowband Filter5(michalsky_lnI_filter5)
 rejected points for the final fit for the Direct Narrowband Filter2(michalsky_rejected_filter2)
 rejected points for the final fit for the Direct Narrowband Filter4(michalsky_rejected_filter4)
 rejected points for the final fit for the Direct Broadband(michalsky_rejected_broadband)
 rejected points for the final fit for the Direct Narrowband Filter3(michalsky_rejected_filter3)
sgpmfrsrlangleyE13.c1:  number of points used in final linear fit for the Direct Broadband(michalsky_number_points_broadband)
 rejection flag for Direct Narrowband Filter4(michalsky_badflag_filter4)
 standard deviation around regression line for the Direct Narrowband Filter4(michalsky_standard_deviation_filter4)
 rejection flag for Direct Narrowband Filter1(michalsky_badflag_filter1)
 error in final linear fit for the Direct Narrowband Filter4(barnard_error_fit_filter4)
 standard deviation around regression line for the Direct Narrowband Filter5(michalsky_standard_deviation_filter5)
 number of points used in final linear fit for the Direct Narrowband Filter1(michalsky_number_points_filter1)
 rejection flag for Direct Narrowband Filter6(barnard_badflag_filter6)
 standard deviation around regression line for the Direct Narrowband Filter3(michalsky_standard_deviation_filter3)
 optical depth for the Direct Narrowband Filter4(barnard_optical_depth_filter4)
 percentage of initial points used in final linear fit for the Direct Narrowband
Filter1(barnard_good_fraction_filter1)  percentage of initial points used in final linear fit for the Direct Broadband(barnard_good_fraction_broadband)
 percentage of initial points used in final linear fit for the Direct Narrowband
Filter1(michalsky_good_fraction_filter1)  rejection flag for Direct Narrowband Filter5(barnard_badflag_filter5)
 rejection flag for Direct Narrowband Filter5(michalsky_badflag_filter5)
 percentage of initial points used in final linear fit for the Direct Narrowband
Filter3(barnard_good_fraction_filter3)  standard deviation around regression line for the Direct Narrowband Filter2(michalsky_standard_deviation_filter2)
 number of points used in final linear fit for the Direct Narrowband Filter6(michalsky_number_points_filter6)
 number of points used in final linear fit for the Direct Narrowband Filter3(barnard_number_points_filter3)
 rejection flag for Direct Broadband(barnard_badflag_broadband)
 percentage of initial points used in final linear fit for the Direct Narrowband
Filter5(barnard_good_fraction_filter5)  optical depth for the Direct Narrowband Filter6(barnard_optical_depth_filter6)
 error in final linear fit for the Direct Narrowband Filter5(barnard_error_fit_filter5)
 number of points used in final linear fit for the Direct Narrowband Filter3(michalsky_number_points_filter3)
 percentage of initial points used in final linear fit for the Direct Narrowband
Filter3(michalsky_good_fraction_filter3)  number of points used in final linear fit for the Direct Broadband(barnard_number_points_broadband)
 optical depth for the Direct Narrowband Filter3(michalsky_optical_depth_filter3)
 number of points used in final linear fit for the Direct Narrowband Filter2(michalsky_number_points_filter2)
 rejection flag for Direct Narrowband Filter1(barnard_badflag_filter1)
 percentage of initial points used in final linear fit for the Direct Narrowband
Filter2(michalsky_good_fraction_filter2)  error in final linear fit for the Direct Narrowband Filter6(barnard_error_fit_filter6)
 error in optical depth (slope) of final linear fit for the Direct Narrowband
Filter4(barnard_error_slope_filter4)  percentage of initial points used in final linear fit for the Direct Narrowband
Filter2(barnard_good_fraction_filter2)  percentage of initial points used in final linear fit for the Direct Narrowband
Filter6(michalsky_good_fraction_filter6)  percentage of initial points used in final linear fit for the Direct Broadband(michalsky_good_fraction_broadband)
 optical depth for the Direct BroadBand(michalsky_optical_depth_broadband)
 optical depth for the Direct Narrowband Filter2(michalsky_optical_depth_filter2)
 percentage of initial points used in final linear fit for the Direct Narrowband
Filter4(michalsky_good_fraction_filter4)  error in optical depth (slope) of final linear fit for the Direct Narrowband
Filter6(barnard_error_slope_filter6)  optical depth for the Direct Narrowband Filter4(michalsky_optical_depth_filter4)
 rejection flag for Direct Narrowband Filter6(michalsky_badflag_filter6)
 optical depth for the Direct Narrowband Filter5(barnard_optical_depth_filter5)
 number of points used in final linear fit for the Direct Narrowband Filter5(barnard_number_points_filter5)
 number of points used in final linear fit for the Direct Narrowband Filter6(barnard_number_points_filter6)
 percentage of initial points used in final linear fit for the Direct Narrowband
Filter6(barnard_good_fraction_filter6)  optical depth for the Direct Narrowband Filter1(michalsky_optical_depth_filter1)
 error in optical depth (slope) of final linear fit for the Direct Narrowband
Filter2(barnard_error_slope_filter2)  optical depth for the Direct Narrowband Filter6(michalsky_optical_depth_filter6)
 error in final linear fit for the Direct BroadBand(barnard_error_fit_broadband)
 percentage of initial points used in final linear fit for the Direct Narrowband
Filter5(michalsky_good_fraction_filter5)  percentage of initial points used in final linear fit for the Direct Narrowband
Filter4(barnard_good_fraction_filter4)  standard deviation around regression line for the Direct Narrowband Filter6(michalsky_standard_deviation_filter6)
 number of points used in final linear fit for the Direct Narrowband Filter4(michalsky_number_points_filter4)
 rejection flag for Direct Narrowband Filter3(michalsky_badflag_filter3)
 Angstrom exponent(michalsky_angstrom_exponent)
 error in optical depth (slope) of final linear fit for the Direct Narrowband
Filter5(barnard_error_slope_filter5)  error in optical depth (slope) of final linear fit for the Direct Narrowband
Filter3(barnard_error_slope_filter3)  rejection flag for Direct Narrowband Filter2(barnard_badflag_filter2)
 rejection flag for Direct Broadband(michalsky_badflag_broadband)
 optical depth for the Direct Narrowband Filter1(barnard_optical_depth_filter1)
 error in final linear fit for the Direct Narrowband Filter2(barnard_error_fit_filter2)
 number of points used in final linear fit for the Direct Narrowband Filter4(barnard_number_points_filter4)
 Angstrom exponent(barnard_angstrom_exponent)
 standard deviation around regression line for the Direct BroadBand(michalsky_standard_deviation_broadband)
 number of points used in final linear fit for the Direct Narrowband Filter1(barnard_number_points_filter1)
 optical depth for the Direct Narrowband Filter2(barnard_optical_depth_filter2)
 rejection flag for Direct Narrowband Filter2(michalsky_badflag_filter2)
 error in final linear fit for the Direct Narrowband Filter3(barnard_error_fit_filter3)
 number of points used in final linear fit for the Direct Narrowband Filter5(michalsky_number_points_filter5)
 rejection flag for Direct Narrowband Filter3(barnard_badflag_filter3)
 error in optical depth (slope) of final linear fit for the Direct Broadband(barnard_error_slope_broadband)
 optical depth for the Direct BroadBand(barnard_optical_depth_broadband)
 rejection flag for Direct Narrowband Filter4(barnard_badflag_filter4)
 standard deviation around regression line for the Direct Narrowband Filter1(michalsky_standard_deviation_filter1)
 error in final linear fit for the Direct Narrowband Filter1(barnard_error_fit_filter1)
 optical depth for the Direct Narrowband Filter5(michalsky_optical_depth_filter5)
 number of points used in final linear fit for the Direct Narrowband Filter2(barnard_number_points_filter2)
 error in optical depth (slope) of final linear fit for the Direct Narrowband
Filter1(barnard_error_slope_filter1)  optical depth for the Direct Narrowband Filter3(barnard_optical_depth_filter3)
