diff --git a/data/font4.dat b/data/font4.dat
new file mode 100644
index 0000000..33a7d06
--- /dev/null
+++ b/data/font4.dat
@@ -0,0 +1,95 @@
+ 1I[
+ 24MXRFRTST RRFSFST RRXQYQZR[S[TZTYSXRX RRYRZSZSYRY
+ 22I[NFMGMM RNGMM RNFOGMM RWFVGVM RWGVM RWFXGVM
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diff --git a/debian/changelog b/debian/changelog
index cd19606..1d48906 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,24 @@
+grads (3:2.2.1-5) unstable; urgency=medium
+
+ * Transition: move from libgrib2c-dev to libg2c-dev
+ * Standards-Version: 4.6.0
+
+ -- Alastair McKinstry <mckinstry@debian.org> Wed, 11 May 2022 20:10:38 +0100
+
+grads (3:2.2.1-4) unstable; urgency=medium
+
+ * Rebuild against libdap (>= 3.20.7)
+
+ -- Alastair McKinstry <mckinstry@debian.org> Tue, 02 Feb 2021 09:27:21 +0000
+
+grads (3:2.2.1-3) unstable; urgency=medium
+
+ * Use debhelper-compat 13
+ * Use libeditreadline-dev rather than libreadline-dev to avoid legal
+ conflict with GPL-3. Closes: #979093.
+
+ -- Alastair McKinstry <mckinstry@debian.org> Sun, 24 Jan 2021 19:38:24 +0000
+
grads (3:2.2.1-2) unstable; urgency=medium
* Use debhelper-compat (=12)
diff --git a/debian/control b/debian/control
index dfb4177..a5551ce 100644
--- a/debian/control
+++ b/debian/control
@@ -2,17 +2,17 @@ Source: grads
Section: utils
Priority: optional
Maintainer: Alastair McKinstry <mckinstry@debian.org>
-Build-Depends: debhelper-compat (= 12),
+Build-Depends: debhelper-compat (= 13),
pkg-config,
- libreadline-dev,
+ libeditreadline-dev,
libgeotiff-dev,
libssl-dev,
- libgrib2c-dev (>= 1.6.0-3),
+ libg2c-dev,
libnetcdf-dev, netcdf-bin,
zlib1g-dev,
libudunits2-dev,
libhdf5-serial-dev | libhdf5-dev,
- libdap-dev (>= 3.14.0-4),
+ libdap-dev (>= 3.20.7),
libsx-dev (>= 2.08),
libx11-dev,
libxmu-headers,
@@ -23,7 +23,7 @@ Build-Depends: debhelper-compat (= 12),
libaec-dev,
libcairo2-dev
Build-Conflicts: autoconf2.13
-Standards-Version: 4.2.0
+Standards-Version: 4.6.0
Homepage: http://cola.gmu.edu/grads
Vcs-Browser: https://salsa.debian.org:/science-team/grads.git
Vcs-Git: https://salsa.debian.org:/science-team/grads.git
diff --git a/debian/gbp.conf b/debian/gbp.conf
index 0f92903..47ef226 100644
--- a/debian/gbp.conf
+++ b/debian/gbp.conf
@@ -2,11 +2,11 @@
# The default name for the upstream branch is "upstream".
# Change it if the name is different (for instance, "master").
-upstream-branch = upstream
+upstream-branch = upstream/latest
# The default name for the Debian branch is "master".
# Change it if the name is different (for instance, "debian/unstable").
-debian-branch = debian/master
+debian-branch = debian/latest
# git-import-orig uses the following names for the upstream tags.
# Change the value if you are not using git-import-orig
diff --git a/example/model.ctl b/example/model.ctl
new file mode 100644
index 0000000..38f8cae
--- /dev/null
+++ b/example/model.ctl
@@ -0,0 +1,18 @@
+DSET ^model.dat
+OPTIONS little_endian
+UNDEF -2.56E33
+TITLE 5 Days of Sample Model Output
+XDEF 72 LINEAR 0.0 5.0
+YDEF 46 LINEAR -90.0 4.0
+ZDEF 7 LEVELS 1000 850 700 500 300 200 100
+TDEF 5 LINEAR 02JAN1987 1DY
+VARS 8
+PS 0 99 Surface Pressure
+U 7 99 U Winds
+V 7 99 V Winds
+Z 7 99 Geopotential Heights
+T 7 99 Temperature
+Q 5 99 Specific Humidity
+TS 0 99 Surface Temperature
+P 0 99 Precipitation
+ENDVARS
diff --git a/example/model.dat b/example/model.dat
new file mode 100644
index 0000000..d03e19a
Binary files /dev/null and b/example/model.dat differ
diff --git a/example/sample b/example/sample
new file mode 100644
index 0000000..debb905
--- /dev/null
+++ b/example/sample
@@ -0,0 +1,300 @@
+The following sample session will give you a feeling for how to use
+the basic capabilities of GrADS. You will need the data file
+'model.dat' on your system. This sample session takes
+about 30 minutes to run through.
+
+If you have any problems with running or using GrADs, send me
+email: doty@cola.umd.edu.
+
+This data file is described by the data descriptor file 'model.ctl'.
+You may want to look at this file before continuing. The data
+descriptor file describes the actual data file, which in the case
+contains 5 days of global grids that are 72x46 elements in size.
+
+To start up GrADS, enter:
+
+ grads
+
+If grads is not in your current directory, or if it is not in your
+PATH somewhere, you may need to enter the full pathname, ie:
+
+ /usr/homes/smith/grads/grads
+
+GrADS will prompt you with a landscape vs. portrait question; just
+press enter. At this point a graphics output window should open on your
+console. You may wish to move or resize this window. Keep in mind that
+you will be entering GrADS commands from the window where you first
+started GrADS -- this window will need to be made the 'active' window
+and you will not want to entirely cover that window with the grahpics
+output window.
+
+In the text window (where you started grads from), you should now see
+a prompt: ga> You will enter GrADS commands at this prompt and see
+the results displayed in the graphics output window.
+
+The first command you will enter is:
+
+ open model.ctl
+
+You may want to see what is in this file, so enter:
+
+ query file
+
+One of the available variable is called ps, for surface pressure. We
+can display this variable by entering:
+
+ d ps
+
+d is short for display. You will note that by default, GrADS will
+display an X, Y plot at the first time and at the lowest level in the
+data set.
+
+Now you will enter commands to alter the 'dimension environment'. The
+display command (and implicitly, the access, operation, and output
+of the data) will do things with respect to the current dimension
+environment. You control the dimension environment by entering
+set commands:
+
+ clear clear the display
+ set lon -90 set longitude fixed
+ set lat 40 set latitude fixed
+ set lev 500 set level fixed
+ set t 1 set time fixed
+ d z display a variable
+
+In the above sequence of commands, we have set all four GrADS dimensions
+to a single value. When we set a dimension to a single value, we say
+that dimension is fixed. Since all the dimensions are fixed, when we
+display a variable we get a single value, in this case the value at
+the location 90W, 40N, 500mb, and the 1st time in the data set.
+
+If we now enter:
+
+ set lon -180 0 X is now a varying dimension
+ d z
+
+We have set the X dimension, or logitude, to vary. We have done this
+by entering two values on the set command. We now have one varying
+dimension (the other dimensions are still fixed), and when we display
+a variable we get a line grahp, in this case a graph of 500mb Heights
+at 40N.
+
+Now enter:
+
+ clear
+ set lat 0 90
+ d z
+
+We now have two varying dimensions, so by default we get a contour plot.
+If we have 3 varying dimensions:
+
+ c
+ set t 1 5
+ d z
+
+we get an animation sequence, in this case through time.
+
+Now enter:
+
+ clear
+ set lon -90
+ set lat -90 90
+ set lev 1000 100
+ set t 1
+ d t
+ d u
+
+In this case we have set the Y (latitude) and Z (level) dimensions to
+vary, so we get a vertical cross section. We have also displayed two
+variables, which simply overlay each other. You may display as many
+items as you desire overlaid before you enter the clear command.
+
+Another example, in this case with X and T varying (Hovmoller plot):
+
+ c
+ set lon -180 0
+ set lat 40
+ set lev 500
+ set t 1 5
+ d z
+
+Now that you know how to select the portion of the data set to view,
+we will move on to the topic of operations on the data. First, set
+the dimension environment to an Z, Y varying one:
+
+ clear
+ set lon -180 0
+ set lat 0 90
+ set lev 500
+ set t 1
+
+Now lets say that we want to see the temperature in Farenheit instead of
+Kelvin. We can do the conversion by entering:
+
+ display (t-273.16)*9/5+32
+
+Any expression may be entered that involves the standard operators of
++, -, *, and /, and which involves operands which may be contants,
+variables, or functions. An example involving functions:
+
+ clear
+ d sqrt(u*u+v*v)
+
+to calculate the magnitude of the wind. A function is provided to
+do this calculation directly:
+
+ d mag(u,v)
+
+Another built in function is the averaging function:
+
+ clear
+ d ave(z,t=1,t=5)
+
+In this case we calculate the 5 day mean. We can also remove the
+mean from the current field:
+
+ d z - ave(z,t=1,t=5)
+
+We can also take means over longitude to remove the zonal mean:
+
+ clear
+ d z-ave(z,x=1,x=72)
+ d z
+
+We can also perform time differencing:
+
+ clear
+ d z(t=2)-z(t=1)
+
+This computes the change between the two fields over 1 day. We could
+have also done this calculation using an offset from the current time:
+
+ d z(t+1) - z
+
+The complete specification of a variable name is:
+
+name.file(dim +|-|= value, ...)
+
+If we had two files open, perhaps one with model output, the other
+with analyses, we could take the difference between the two fields
+by entering: display z.2 - z.1
+
+Another built in function calculates horizontal relative vorticity
+via finite differencing:
+
+ clear
+ d hcurl(u,v)
+
+Yet another function takes a mass weighted vertical integral:
+
+ clear
+ d vint(ps,q,275)
+
+Here we have calculated precipitable water in mm.
+
+Now we will move on to the topic of controlling the grahpics output.
+So far, we have allowed GrADS to chose a default contour interval.
+We can override this by:
+
+ clear
+ set cint 30
+ d z
+
+We can also control the contour color by:
+
+ clear
+ set ccolor 3
+ d z
+
+We can select alternate ways of displaying the data:
+
+ clear
+ set gxout shaded
+ d hcurl(u,v)
+
+This is not very smooth; we can apply a cubic smoother by entering:
+
+ clear
+ set csmooth on
+ d hcurl(u,v)
+
+We can overlay different grahpics types:
+
+ set gxout contour
+ set ccolor 0
+ set cint 30
+ d z
+
+and we can annotate:
+
+ draw title 500mb Heights and Vorticity
+
+We can view wind vectors:
+
+ clear
+ set gxout vector
+ d u;v
+
+Here we are displaying two expressions, the first for the U component of
+the vector; the 2nd the V component of the vector. We can also
+colorize the vectors by specifying a 3rd field:
+
+ d u;v;q
+
+or maybe:
+
+ d u;v;hcurl(u,v)
+
+You may display psuedo vectors by displaying any field you want:
+
+ clear
+ d mag(u,v) ; q*10000
+
+Here the U component is the wind speed; the V component is moisture.
+
+We can also view streamlines (and colorize them):
+
+ clear
+ set gxout stream
+ d u;v;hcurl(u,v)
+
+Or we can display actual grid point values:
+
+ clear
+ set gxout grid
+ d u
+
+We may wish to alter the map background:
+
+ clear
+ set lon -110 -70
+ set lat 30 45
+ set mpdset nam
+ set digsiz 0.2 Digit size
+ set dignum 2 # of digits after decimal place
+ d u
+
+To alter the projection:
+
+ set lon -140 -40
+ set lat 15 80
+ set mpvals -120 -75 25 65 Map projection constants
+ set mproj nps North Polar Stereographic
+ set gxout contour
+ set cint 30
+ d z
+
+In this case, we have told grads to access and operate on data from
+longitude 140W to 40W, and latitude 15N to 80N. But we have told it
+to display a polar stereographic plot that contains the region bounded
+by 120W to 75W and 25N to 65N. The extra plotting area is clipped by
+the map projection routine.
+
+This concludes the sample session. At this point, you may wish to
+examine the data set further, or you may want to go through the GrADS
+documentation and try out the other options described there.
+
+
+Brian Doty
+doty@cola.umd.edu
+July 20, 1992
