YSI 556 MPS - Manual (Page 126)

Appendix G EcoWatch
YSI 556 MPS YSI Incorporated Page 120
Now return to the original graphic display by toggling the Table
button “off” and Graph button “on”.
From the Setup menu, click Graph. Click 2 Traces per Graph and notice
that the parameters are now graphed in pairs for easy comparison of
parameters.
Click 1 Trace per Graph to return the display to the original setting. Move
the cursor to any position in the graph, then click and hold the right mouse
button.