| M3-package | Functions to read in and manipulate air quality model output from files in Models3 format | 
| combine.date.and.time | Combine date and time to obtain date-time in POSIX format | 
| decipher.M3.date | Decipher Models3 date format (YYYYDDD) into R's Date class. | 
| decipher.M3.time | Decipher Models3 time format (HHMMSS) into hours, minutes, and seconds. | 
| get.canusamex.bds | Obtain map boundaries for Canada, USA, and Mexico | 
| get.coord.for.dimension | Get the grid coordinates for the grid rows or columns. | 
| get.datetime.seq | Read in a sequence of date-time steps from a Models3-formatted file. | 
| get.grid.info.M3 | Get information about the grid used by the air quality model | 
| get.M3.var | Read in variable values from Models3-formatted files | 
| get.map.lines.M3.proj | Get map lines in the model projection units | 
| get.matrix.all.grid.cell.ctrs | Obtain a matrix giving the locations of the grid cell centers | 
| get.proj.info.M3 | Obtain information about the projection used in the Models3 file | 
| M3 | Functions to read in and manipulate air quality model output from files in Models3 format | 
| project.lonlat.to.M3 | Project coordinates from longitude/latitude to model units. | 
| project.M3.1.to.M3.2 | Project coordinates based on projection in the first file to the projection given in the second | 
| project.M3.to.lonlat | Project coordinates from model units to longitude/latitude | 
| var.subset | Subset the array resulting from a call to 'get.M3.var'. |