getStandingKatzCurve: Read file with readings from Standing-Katz chart, create data...
In f0nzie/zFactor: Calculate the Compressibility Factor 'z' for Hydrocarbon Gases

Read a .txt file that was created from readings of the Standing-Katz chart, then convert it to a .rda file and plot the curve for given Tpr. If no values are supplied, the function will plot the SK curve at Tpr=1.30, low Ppr.

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getStandingKatzCurve(tpr = 1.3, pprRange = "lp", tolerance = 0.01,
  toView = FALSE, toSave = FALSE, toPlot = TRUE, ylim = c(0.2,
  1.2))

`tpr`	Pseudo-reduced temperature curve in SK chart
`pprRange`	Takes one of two values: "lp": low pressure, or "hp" for high pressure
`tolerance`	rounding tolerance to avoid rounding readings that are in the middle of the grid. "tolerance" adds flexibility in deciding point closeness. Default value is 0.01.
`toView`	set to FALSE to prevent visualizing the dataframe
`toSave`	set to FALSE to indicate if the .rda file will not be saved to disk
`toPlot`	set to FALSE to indicate the dataset will not be plotted
`ylim`	minimum (0.2) and maximum (1.2) limits for the y-scale

# get SK curve for low-pressure chart
getStandingKatzCurve()
# get SK curve for high-pressure chart
getStandingKatzCurve(tpr = 1.3, pprRange = 'hp', toView = FALSE, toSave = FALSE)