How to remove the space taken by date not appear in the data in a date plot?

Question

For the following input,

Date    Visits
11/1/2010   696537
11/3/2010   799355
11/4/2010   805800
11/5/2010   701262
11/6/2010   531579
11/7/2010   690068
11/8/2010   756947
11/10/2010  701768
11/11/2010  820113
11/12/2010  645259

When I run the following code, I see 11/3/2010 still takes a space. Is there a way to remove the space taken by that date in the plot? What is the general method to skip all the dates not in the data?

f$Date <- as.Date(f$Date, "%m/%d/%Y")
plot(Visits ~ Date, f, xaxt = "n", type = "l")
axis(1, f$Date, format(f$Date, "%b %d"), cex.axis = .7)

Answer 1

Since you didn't seem to pick up on my comment, I'm including it here after testing. The underlying x-axis scale is now integers starting from 1.

 f <- read.table(text="Date    Visits
 11/1/2010   696537
 11/3/2010   799355
 11/4/2010   805800
 11/5/2010   701262
 11/6/2010   531579
 11/7/2010   690068
 11/8/2010   756947
 11/10/2010  701768
 11/11/2010  820113
 11/12/2010  645259", head=T)
 f$Date <- as.Date(f$Date, "%m/%d/%Y")
 plot(Visits ~ seq_along(Date), f, xaxt = "n", type = "l")
 axis(1, seq_along(f$Date), format(f$Date, "%b %d"), cex.axis = .7)