improvements/fixes to the README

README.md

@@ -50,16 +50,37 @@ figures of merit for gravitational wave detector budgets.  See the
 
 `pygwinc` provides a command line interface that can be used to
 calculate and plot the various canonical IFO noise budgets described
-above, as well as custom noise budgets (see below):
+above:
 ```shell
 $ python3 -m gwinc aLIGO
 ```
-Budget plots save/plot hdf5 trace data, and dump budget IFO parameters:
+Or [Custom budgets](#budget-interface) may also be processed by providing
+the path to the budget module/package:
+```shell
+$ python3 -m gwinc path/to/mybudget
+```
+
+Budget plots can be saved in various formats (.png, .svg, .pdf):
+```shell
+$ python3 -m gwinc --save aLIGO.png aLIGO
+```
+Or trace data can be saved to an
+[HDF5](https://en.wikipedia.org/wiki/Hierarchical_Data_Format) file:
+```shell
+$ python3 -m gwinc --save aLIGO.hdf5 aLIGO
+```
+Trace HDF5 files can also be plotted directly:
+```shell
+$ python3 -m gwinc aLIGO.hdf5
+```
 
-You can play with IFO parameters and see the effects on the budget by
-dumping the pre-defined parameters to a [YAML-formatted parameter
-file](#yaml-parameter-files), editing the parameter file, and
-re-calculating the noise budget:
+IFO parameters can be manipulated from the command line with the
+`--ifo` option:
+```shell
+$ python3 -m gwinc aLIGO --ifo Optics.SRM.Tunephase=3.14
+```
+You can also dump the IFO parameters to a [YAML-formatted parameter
+file](#yaml-parameter-files):
 ```shell
 $ python3 -m gwinc --yaml aLIGO > my_aLIGO.yaml
 $ edit my_aLIGO.yaml
@@ -68,22 +89,9 @@ $ python3 -m gwinc -d my_aLIGO.yaml aLIGO
 Materials.Coating.Philown    5e-05            3e-05
 $ python3 -m gwinc my_aLIGO.yaml
 ```
-
-You can also use the `--ifo` option to change parameters from the
-command line:
-```shell
-$ python3 -m gwinc aLIGO --ifo Optics.SRM.Tunephase=3.14
-```
-
 Stand-alone YAML files assume the nominal ['aLIGO' budget
 description](gwinc/ifo/aLIGO).
 
-[Custom budgets](#budget-interface) may also be processed by providing
-the path to the budget module/package:
-```shell
-$ python3 -m gwinc path/to/mybudget
-```
-
 The command line interface also includes an "interactive" mode which
 provides an [IPython](https://ipython.org/) shell for interacting with
 a processed budget: