read_6800dir: Reads files from the Li-Cor 6800 including Ci measured...
In jtominaga/dirci: Direct Ci Calculations

Reads files from the Li-Cor 6800 including Ci measured directly read_6800dir Reads Li-Cor 6800 files, which are deliminated by spaces and tabs.

1 2	read_6800dir(filename, skiplines, cimin, cimax, amin, amax, co2list, log_freq, deltaP)

`filename`	A character string of the form: "mydata".
`skiplines`	A nuber specifying the number of header lines to skip.
`cimin`	Minimum Ci cutoff
`cimax`	Maximum Ci cutoff
`amin`	Minimum A cutoff
`amax`	Maximum A cutoff
`co2list`	vector of CO2 reference values used
`log_freq`	Frequency in seconds of logging data
`deltaP`	Overpressure value