21
o
Zoom
In
Zoom
In
allows
a
region
of
the
chart
to
be
enlarged
so
that
it
may
be
viewed
in
greater
detail.
To
enlarge
a
region
of
the
chart,
click
on
the
two
data
points
that
define
the
left
and
right
boundaries
of
the
region.
In
zoom
mode,
the
mouse
pointer
will
change
to
a
cross
‐
hair.
When
zoom
mode
ends,
the
mouse
pointer
will
return
to
its
normal
state.
To
cancel
zoom
mode,
click
Cancel
Zoom
In
from
the
Tools
menu,
or
simply
press
the
Esc
key.
o
Zoom
Out
Zoom
Out
restores
the
initial
view
of
the
chart,
which
displays
the
full
data
set.
o
Calculate
Corrosion
Rate
If
the
chart
contains
ER
data,
the
Calculate
Corrosion
Rate
option
will
become
available
under
the
Tools
menu.
This
option
allows
the
corrosion
rate
to
be
calculated
between
any
two
data
points
on
the
chart.
To
calculate
the
corrosion
rate
click
Calculate
Corrosion
Rate
,
then
click
two
data
points.
The
corrosion
rate
between
those
two
data
points
will
be
displayed.
In
calculate
mode,
the
mouse
pointer
will
change
to
an
arrow/question
mark.
When
calculate
mode
ends,
the
mouse
pointer
will
return
to
its
normal
state.
To
cancel
a
calculation,
click
Cancel
Calculate
from
the
Tools
menu,
or
simply
press
the
Esc
key.
