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src/sas/qtgui/Perspectives/Corfunc/media/corfunc_help.rst
r417c03f rb86754f 253 253  254 254 Upon sending data for correlation function analysis, it will be plotted (minus 255 the background value), along with a *red*bar indicating the *upper end of the256 lowQ range* (used for Guinier backextrapolation), and 2 *purple*bars indicating255 the background value), along with a bar indicating the *upper end of the 256 lowQ range* (used for Guinier backextrapolation), and 2 bars indicating 257 257 the range to be used for Porod forwardextrapolation. These bars may be moved by 258 grabbing and dragging, or byentering appropriate values in the Q range input boxes.258 entering appropriate values in the Q range input boxes. 259 259 260 260 .. figure:: tutorial1.png 261 261 :align: center 262 262 263 Once the Q ranges have been set, click the "Calculate Bg" button to determine the 264 background level. Alternatively, enter your own value into the box. If the box turns 263 Once the Q ranges have been set, click the "Calculate" button in the *Background* section 264 of the dialog to determine the background level. 265 Alternatively, enter your own value into the box. If the box turns 265 266 yellow this indicates that background subtraction has created some negative intensities. 266 267 … … 273 274 :align: center 274 275 275 Now select which type of transform you would like to perform, using the radio 276 buttons: 277 278 * **Fourier**: to perform a Fourier Transform to calculate the correlation 279 functions 280 * **Hilbert**: to perform a Hilbert Transform to calculate the volume fraction 281 profile 282 283 and click the "Transform" button to perform the selected transform and plot 276 Now click the "Transform" button to perform the **Fourier** transform and plot 284 277 the results. 285 278 … … 287 280 :align: center 288 281 289 If a Fourier Transform was performed, the "Compute Parameters" button can now be290 clicked to interpret the correlation function as described earlier. The parameters291 will appear in the "Output Parameters" section of the SasView GUI.292 293 .. figure:: tutorial4.png294 :align: center295 296 297 282 .. note:: 298 283 This help document was last changed by Steve King, 26Sep2017
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