plotting arrows with psxy and layer transparency...gmt-4.5.1 and 5.1.0

Dear All,

I'm trying to plot arrows on my diagram using gmt-5.1.0 by giving starting (tail) and end (arrow head) points as input. It is working with the older version of gmt-4.5.1, but have trouble with the recent version, gmt-5.1.0. Further, it works fine when i use azimuth and length in the 3rd and 4th columns, but instead if i use end point (x,y), it draws an infinite line outside my map area, not in the direction of given end point. The following are the codes that i used in both the cases.

using gmt-4.5.1
psxy -R -J -SVs -Gred -N -K -O << EOF >> $PS
12700 2.3 12900 2.5 
EOF

using gmt-5.1.0
psxy -R -J -S -Gred -N -K -O --MAP_VECTOR_SHAPE=0.5 << EOF >> $PS
12700 2.3 12900 2.5 V0.2i+s+e
EOF

I also tried using some commands from gmt-4.5.1 and some from gmt-5.1.0, but it fails to recognize the later one? Can't we use both the versions together?

One final question, is it possible to set layer transparency in gmt-4.5.1, like -t and -G options in gmt-5.1.0?  I appreciate any comments/help.

Cheers


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