Produce a normal (or t) distribution and shaded tail.

```
normTail(
m = 0,
s = 1,
L = NULL,
U = NULL,
M = NULL,
df = 1000,
curveColor = 1,
border = 1,
col = "#CCCCCC",
xlim = NULL,
ylim = NULL,
xlab = "",
ylab = "",
digits = 2,
axes = 1,
detail = 999,
xLab = c("number", "symbol"),
cex.axis = 1,
xAxisIncr = 1,
add = FALSE,
...
)
```

- m
Numerical value for the distribution mean.

- s
Numerical value for the distribution standard deviation.

- L
Numerical value representing the cutoff for a shaded lower tail.

- U
Numerical value representing the cutoff for a shaded upper tail.

- M
Numerical value representing the cutoff for a shaded central region.

- df
Numerical value describing the degrees of freedom. Default is

`1000`

, which results in a nearly normal distribution. Small values may be useful to emphasize small tails.- curveColor
The color for the distribution curve.

- border
The color for the border of the shaded area.

- col
The color for filling the shaded area.

- xlim
Limits for the x axis.

- ylim
Limits for the y axis.

- xlab
A title for the x axis.

- ylab
A title for the y axis.

- digits
The maximum number of digits past the decimal to use in axes values.

- axes
A numeric value denoting whether to draw both axes (

`3`

), only the vertical axes (`2`

), only the horizontal axes (`1`

, the default), or no axes (`0`

).- detail
A number describing the number of points to use in drawing the normal curve. Smaller values correspond to a less smooth curve but reduced memory usage in the final file.

- xLab
If

`"number"`

, then the axis is drawn at the mean, and every standard deviation out until the third standard deviation. If`"symbol"`

, then Greek letters are used for standard deviations from three standard deviations from the mean.- cex.axis
Numerical value controlling the size of the axis labels.

- xAxisIncr
A number describing how often axis labels are placed, scaled by standard deviations. This argument is ignored if

`xLab = "symbol"`

.- add
Boolean indicating whether to add this normal curve to the existing plot.

- ...
Additional arguments to

`plot`

.

David Diez

```
normTail(3, 2, 5)
normTail(3, 2, 1, xLab = 'symbol')
normTail(3, 2, M = 1:2, xLab = 'symbol', cex.axis = 0.8)
normTail(3, 2, U = 5, axes = FALSE)
normTail(L = -1, U = 2, M = c(0, 1), axes = 3, xAxisIncr = 2)
normTail(L = -1, U = 2, M = c(0, 1),
xLab = 'symbol', cex.axis = 0.8, xAxisIncr = 2)
```