diff --git a/pineappl/src/boc.rs b/pineappl/src/boc.rs
index b71f9a95..cdc0cfcc 100644
--- a/pineappl/src/boc.rs
+++ b/pineappl/src/boc.rs
@@ -24,8 +24,10 @@ pub struct Order {
     pub alpha: u32,
     /// Exponent of the logarithm of the scale factor of the renomalization scale.
     pub logxir: u32,
-    /// Exponent of the logarithm of the scale factor of the factorization scale.
+    /// Exponent of the logarithm of the scale factor of the initial state factorization scale.
     pub logxif: u32,
+    /// Exponent of the logarithm of the scale factor of the final state factorization scale (fragmentation scale).
+    pub logxia: u32,
 }
 
 impl FromStr for Order {
@@ -37,6 +39,7 @@ impl FromStr for Order {
             alpha: 0,
             logxir: 0,
             logxif: 0,
+            logxia: 0,
         };
 
         for tuple in s
@@ -61,6 +64,9 @@ impl FromStr for Order {
                 ("lf", Ok(num)) => {
                     result.logxif = num;
                 }
+                ("la", Ok(num)) => {
+                    result.logxia = num;
+                }
                 (label, Err(err)) => {
                     return Err(ParseOrderError(format!(
                         "error while parsing exponent of '{label}': {err}"
@@ -82,10 +88,11 @@ impl Ord for Order {
         // rest lexicographically
         (self.alphas + self.alpha)
             .cmp(&(other.alphas + other.alpha))
-            .then((self.alpha, self.logxir, self.logxif).cmp(&(
+            .then((self.alpha, self.logxir, self.logxif, self.logxia).cmp(&(
                 other.alpha,
                 other.logxir,
                 other.logxif,
+                other.logxia,
             )))
     }
 }
@@ -100,12 +107,13 @@ impl Order {
     /// Constructor. This function mainly exists to have a way of constructing `Order` that is less
     /// verbose.
     #[must_use]
-    pub const fn new(alphas: u32, alpha: u32, logxir: u32, logxif: u32) -> Self {
+    pub const fn new(alphas: u32, alpha: u32, logxir: u32, logxif: u32, logxia: u32) -> Self {
         Self {
             alphas,
             alpha,
             logxir,
             logxif,
+            logxia,
         }
     }
 
@@ -238,8 +246,9 @@ impl Order {
                      alpha,
                      logxir,
                      logxif,
+                     logxia,
                  }| {
-                    if !logs && (logxir > 0 || logxif > 0) {
+                    if !logs && (logxir > 0 || logxif > 0 || logxia > 0) {
                         return false;
                     }
 
diff --git a/pineappl/src/fk_table.rs b/pineappl/src/fk_table.rs
index 6b3bcb12..056919c3 100644
--- a/pineappl/src/fk_table.rs
+++ b/pineappl/src/fk_table.rs
@@ -364,6 +364,7 @@ impl TryFrom<Grid> for FkTable {
                 alpha: 0,
                 logxir: 0,
                 logxif: 0,
+                logxia: 0,
             }]
         {
             return Err(TryFromGridError::NonTrivialOrder);
diff --git a/pineappl/src/grid.rs b/pineappl/src/grid.rs
index 18c36847..998e8d27 100644
--- a/pineappl/src/grid.rs
+++ b/pineappl/src/grid.rs
@@ -1458,7 +1458,7 @@ impl Grid {
                 subgrids,
                 channels,
                 bin_limits: self.bin_limits.clone(),
-                orders: vec![Order::new(0, 0, 0, 0)],
+                orders: vec![Order::new(0, 0, 0, 0, 0)],
                 subgrid_params: SubgridParams::default(),
                 more_members: self.more_members.clone(),
             };
@@ -1594,7 +1594,7 @@ impl Grid {
                 subgrids,
                 channels,
                 bin_limits: self.bin_limits.clone(),
-                orders: vec![Order::new(0, 0, 0, 0)],
+                orders: vec![Order::new(0, 0, 0, 0, 0)],
                 subgrid_params: SubgridParams::default(),
                 more_members: self.more_members.clone(),
             };
diff --git a/pineappl_capi/src/lib.rs b/pineappl_capi/src/lib.rs
index cab56b19..9707d157 100644
--- a/pineappl_capi/src/lib.rs
+++ b/pineappl_capi/src/lib.rs
@@ -685,6 +685,7 @@ pub unsafe extern "C" fn pineappl_grid_new(
             alpha: s[1],
             logxir: s[2],
             logxif: s[3],
+            logxia: s[4],
         })
         .collect();
 
diff --git a/pineappl_cli/src/export.rs b/pineappl_cli/src/export.rs
index e4ee819d..124ad83a 100644
--- a/pineappl_cli/src/export.rs
+++ b/pineappl_cli/src/export.rs
@@ -118,6 +118,7 @@ impl Subcommand for Opts {
             alpha,
             logxir,
             logxif,
+            logxia,
         } in grid
             .orders()
             .iter()
@@ -138,6 +139,7 @@ impl Subcommand for Opts {
                         alpha,
                         logxir,
                         logxif,
+                        logxia,
                     },
                     keep,
                 )| {
diff --git a/pineappl_cli/src/plot.rs b/pineappl_cli/src/plot.rs
index ea948508..657e98e0 100644
--- a/pineappl_cli/src/plot.rs
+++ b/pineappl_cli/src/plot.rs
@@ -112,8 +112,16 @@ fn map_format_channel(channel: &Channel, has_pdf1: bool, has_pdf2: bool) -> Stri
         .map(|(pids, _)| {
             format!(
                 "{}{}",
-                if has_pdf1 { map_format_parton(pids[0]) } else { "" },
-                if has_pdf2 { map_format_parton(pids[1]) } else { "" }
+                if has_pdf1 {
+                    map_format_parton(pids[0])
+                } else {
+                    ""
+                },
+                if has_pdf2 {
+                    map_format_parton(pids[1])
+                } else {
+                    ""
+                }
             )
         })
         .join(" + ")
diff --git a/pineappl_cli/src/read.rs b/pineappl_cli/src/read.rs
index 33230c7d..a415b513 100644
--- a/pineappl_cli/src/read.rs
+++ b/pineappl_cli/src/read.rs
@@ -125,7 +125,10 @@ impl Subcommand for Opts {
                 row.add_cell(cell!(format!("{index}")));
 
                 for (pids, factor) in channel.entry() {
-                    row.add_cell(cell!(format!("{factor} \u{d7} ({})", pids.iter().map(ToString::to_string).join(", "))));
+                    row.add_cell(cell!(format!(
+                        "{factor} \u{d7} ({})",
+                        pids.iter().map(ToString::to_string).join(", ")
+                    )));
                 }
             }
         } else if self.group.ew || self.group.qcd {
@@ -210,6 +213,7 @@ impl Subcommand for Opts {
                     alpha,
                     logxir,
                     logxif,
+                    logxia,
                 } = order;
 
                 let order_string = [alphas, alpha, logxir, logxif]