Index: src/sas/perspectives/calculator/media/slit_calculator_help.rst
===================================================================
--- src/sas/perspectives/calculator/media/slit_calculator_help.rst	(revision ec392464eef959a5c2e87e6a72ed72fd7e947a07)
+++ src/sas/perspectives/calculator/media/slit_calculator_help.rst	(revision 8a22b5bbed26e6496886bbca2614423e87f7b354)
@@ -3,4 +3,7 @@
 .. This is a port of the original SasView html help file to ReSTructured text
 .. by S King, ISIS, during SasView CodeCamp-III in Feb 2015.
+
+.. |Ang| unicode:: U+212B
+.. |TM| unicode:: U+2122
 
 Slit Size Calculator Tool
@@ -9,6 +12,11 @@
 Description
 -----------
-This tool is for X-ray users to calculate the slit size (FWHM/2) for smearing 
-based on their half beam profile data (SAXSess).
+
+This tool enables X-ray users to calculate the slit size (FWHM/2) for smearing 
+based on their half beam profile data.
+
+*NOTE! Whilst it may have some more generic applicability, the calculator has
+only been tested with beam profile data from Anton-Paar SAXSess*\ |TM|\  
+*software.*
 
 .. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
@@ -16,16 +24,20 @@
 How To
 -------
-To calculate the slit size (FWHM/2), just load the beam profile data using the 
-browse button.
 
-Once a data is loaded, the slit size will be computed and show up in the text 
-box.
+1) Select *Slit Size Calculator* from the *Tool* menu on the SasView toolbar.
 
-Because the unit is not specified in the data file, we do not convert it into 
-1/Angstrom so  users are responsible for converting the units of their data.
+2) Load a beam profile file in the *Data* field using the *Browse* button.
 
-Note: This slit size calculator only works for beam profile data produced by 
-'SAXSess'.
+   *NOTE! To see an example of the beam profile file format, visit the file 
+   beam profile.DAT in your {installation_directory}/SasView/test folder.*
 
-To see the file format, check the file, 'beam profile.DAT', in the 'test' 
-folder of SasView.
+3) Once a data is loaded, the slit size is automatically computed and displayed 
+   in the tool window.
+
+*NOTE! The beam profile file does not carry any information about the units of 
+the Q data. This calculator assumes the data has units of 1/\ |Ang| . If the 
+data is not in these units it must be manually converted beforehand.*
+
+.. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
+
+.. note::  This help document was last changed by Steve King, 19Feb2015
Index: src/sas/perspectives/pr/media/pr_help.rst
===================================================================
--- src/sas/perspectives/pr/media/pr_help.rst	(revision ec392464eef959a5c2e87e6a72ed72fd7e947a07)
+++ src/sas/perspectives/pr/media/pr_help.rst	(revision 8a22b5bbed26e6496886bbca2614423e87f7b354)
@@ -5,4 +5,6 @@
 
 .. |pi| unicode:: U+03C0
+.. |bigphi| unicode:: U+03A6
+.. |bigsigma| unicode:: U+03A3
 .. |chi| unicode:: U+03C7
 
@@ -10,27 +12,51 @@
 ==========================
 
-The inversion approach is based on Moore, J. Appl. Cryst., (1980) 13, 168-175.
+Description
+-----------
 
-P(r) is set to be equal to an expansion of base functions of the type
-phi_n(r) = 2 * r * sin(|pi| * n * r / D_max).
+This tool calculates a real-space distance distribution function, *P(r)*, using 
+the inversion approach (Moore, 1908).
+
+*P(r)* is set to be equal to an expansion of base functions of the type
+
+  |bigphi|\_n(r) = 2.r.sin(|pi|\ .n.r/D_max)
 
 The coefficient of each base function in the expansion is found by performing 
-a least square fit with the following fit function:
+a least square fit with the following fit function
 
-|chi| ^2 = sum_i[ I_meas(q_i) - I_th(q_i) ]^2 / error^2 + Reg_term
+  |chi|\ :sup:`2` = |bigsigma|\ :sub:`i` [ I\ :sub:`meas`\ (Q\ :sub:`i`\ ) - I\ :sub:`th`\ (Q\ :sub:`i`\ ) ] :sup:`2` / (Error) :sup:`2` + Reg_term
 
-where I_meas(q) is the measured scattering intensity and I_th(q) is the 
-prediction from the Fourier transform of the P(r) expansion. 
+where I\ :sub:`meas`\ (Q) is the measured scattering intensity and 
+I\ :sub:`th`\ (Q) is the prediction from the Fourier transform of the *P(r)* 
+expansion. 
 
-The Reg_term term is a regularization term set to the second derivative 
-d^2 P(r) / dr^2 integrated over r. It is used to produce a smooth P(r) output.
+The *Reg_term* term is a regularization term set to the second derivative 
+d\ :sup:`2`\ *P(r)* / dr\ :sup:`2` integrated over *r*. It is used to produce a 
+smooth *P(r)* output.
 
-The following are user inputs:
+.. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
 
-*  Number of terms: the number of base functions in the P(r) expansion.
+How To
+------
+
+The user must enter
+
+*  *Number of terms*: the number of base functions in the P(r) expansion.
    
-*  Regularization constant: a multiplicative constant to set the size of
+*  *Regularization constant*: a multiplicative constant to set the size of
    the regularization term.
 
-*  Maximum distance: the maximum distance between any two points in the
+*  *Maximum distance*: the maximum distance between any two points in the
    system.
+
+.. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
+
+Reference
+---------
+
+P.B. Moore
+*J. Appl. Cryst.*, 13 (1980) 168-175
+
+.. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
+
+.. note::  This help document was last changed by Steve King, 19Feb2015
