
	User's Guide Contents
	Return to ETC Welcome SYNPHOT SNR and Exposure Time SNR Time Optimal SNR Spectroscopy Target Acquisition Basic Use Page Heirarchy Reference Extraction Regions Spectral Distribution User Spectra Other Spectra Extinction Normalization Background CCD Parameters ID Number Calculations SYNPHOT Calls Call Descriptions Call Parameters NICMOS Spectroscopic Extraction Regions Tables Spectral Elements NICMOS Filters NICMOS Dispersers ACS Filters and Dispersers COS Dispersers WFC3 Filters and Dispersers STIS Filters and Dispersers NICMOS Tables COS Tables STIS Tables and Topical Help

Basic Use

Using the ETC is quite simple. Once you have traversed to the desired ETC web page based on the instrument and science mode, simply enter the specified parameters for each of the 6 sections listed below, then click the “Submit” button to retrieve your results. All 6 sections contain defaults preloaded, so at any point you can submit the current settings for ETC calculation and report generation.