[R] Multiple figures margin problem

[mnstn]

Hello All, 
I am trying to make a figure with 3x2 plots in it. Let us name the plots as
such: 

1 2 
3 4 
5 6 

I begin my script with: 
par(mfcol=c(3,2)) 
par(oma=c(0,0,0,0)) --> This is for a postscript figure so I really don't
need the outer margins. 
d=5 
par(mar=c(d,d,d,d))  --> This applies to all the 6 plots. 

Now if d=0, plots 1-2,3-4 and 5-6 will have no gap between them and 1-3-5
and 2-4-6 will not have any spacing either. This is how I want it. But I
also want y axis points and y label for 1, 3 and 5 and x axis points and
labels for 5 and 6. With d=0, there is no space left for these labels. With
d=5 (for ex.) I can have the labels but it also introduces a gap of 'd' text
lines between the plots. I have tried: 

par(mar=c(0,d,0,0)) 
plot 1 
par(mar=c(0,d,0,0)) 
plot 3 
par(mar=c(d,d,0,0)) 
plot 5 
par(mar=c(0,0,0,0)) 
plot 2 
par(mar=c(0,0,0,0)) 
plot 4 
par(mar=c(d,0,0,0)) 
plot 6 

But in this approach, the plots are all not of the same size because of
differences in margins and I want all the plots to be square and look
similar when printed. Do have any comments or suggestions on how to go about
doing it? 
Thanks, 
MoonStone
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