update readme

README.md

@@ -253,7 +253,7 @@ You will need to logout and login for the launcher to take effect.
 |![import custom map](https://github.com/semuconsulting/PyGPSClient/blob/master/images/importcustommap.png?raw=true)| <a name="custommap">Import Custom Map dialog</a>. Click ![load icon](https://github.com/semuconsulting/PyGPSClient/blob/master/src/pygpsclient/resources/iconmonstr-folder-18-24.png?raw=true) to open the custom map image location (*the default file suffix is `*.gif` - select Show Options to select any file suffix `*.*`*). If the `rasterio` library is installed and the image is georeferenced (e.g. using [QGIS](https://qgis.org/)), the bounding box will be automatically extracted - otherwise it must be entered manually. Import the custom map path and bounding box settings by clicking ![play icon](https://github.com/semuconsulting/PyGPSClient/blob/master/src/pygpsclient/resources/iconmonstr-arrow-12-24.png?raw=true).|
 |![spectrum widget](https://github.com/semuconsulting/PyGPSClient/blob/master/images/spectrum_widget.png?raw=true)| Spectrum widget showing a spectrum analysis chart (*GNSS receiver must be capable of outputting UBX MON-SPAN messages*). Clicking anywhere in the spectrum chart will display the frequency and decibel reading at that point. Double-clicking anywhere in the chart will toggle the GNSS frequency band markers (L1, G2, etc.) on or off. **NB:** Some receivers (e.g. NEO-F10N) will not output the requisite MON-SPAN messages unless the port baud rate is at least 57,600. |
 |![sysmon widget](https://github.com/semuconsulting/PyGPSClient/blob/master/images/sysmon_widget.png?raw=true)| System Monitor widget showing device cpu, memory and I/O utilisation (*GNSS receiver must be capable of outputting UBX MON-SYS and/or MON-COMMS messages*). Tick checkbox to toggle between actual (cumulative) I/O stats and pending I/O. |
-|![scatterplot widget](https://github.com/semuconsulting/PyGPSClient/blob/RC-1.4.25/images/scatterplot_widget.png?raw=true)| Scatterplot widget showing variability in position reporting over time. Select from either Planar or Great Circle (haversine) distance approximation mode. Select from either Dynamic or Fixed to center plot on dynamic average position (*displayed at top left*) or fixed reference position (*if entered*). Use the scale slider or mousewheel to adjust scale. Double-click to clear existing plot. The default mode, center, scale index and fixed reference position can be stored in the json configuration file as `scattermode_s`/`scattercenter_s`/`scatterscale_n`/`scatterlat_f`/`scatterlon_f`. |
+|![scatterplot widget](https://github.com/semuconsulting/PyGPSClient/blob/master/images/scatterplot_widget.png?raw=true)| Scatterplot widget showing variability in position reporting over time. Select from either Planar or Great Circle (haversine) distance approximation mode. Select from either Dynamic or Fixed to center plot on dynamic average position (*displayed at top left*) or fixed reference position (*if entered*). Use the scale slider or mousewheel to adjust scale. Double-click to clear existing plot. The default mode, center, scale index and fixed reference position can be stored in the json configuration file as `scattermode_s`/`scattercenter_s`/`scatterscale_n`/`scatterlat_f`/`scatterlon_f`. |
 |![rover widget](https://github.com/semuconsulting/PyGPSClient/blob/master/images/rover_widget.png?raw=true) | Rover widget plots the relative 2D position, track and status information for the roving receiver in a fixed or moving base / rover RTK configuration. Can also display relative position of NTRIP mountpoint and receiver in a static RTK configuration. Double-click to clear existing plot. (*GNSS rover receiver must be capable of outputting UBX NAV-RELPOSNED messages.*) |
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 ## <a name="ubxconfig">UBX Configuration Facilities</a>